MXPA06014525A - Hair colouring or bleaching compositions - Google Patents

Abstract

This invention is a two part system for coloring or bleaching hair which comprises (i) a thin lotion optionally comprising an oxidative dye and comprising a solvent system and a surfactant system to trigger a thickening upon dilution with a developer, and (ii) a developer which comprises a scalp-irritating amount of an oxidising agent. In the system of the invention, the lotion has a Lamellar Phase Index of greater than 80%.

Description

COLORING OR DECOLORATING HAIR COMPOSITIONS FIELD OF THE INVENTION The present composition refers to two-part aqueous compositions for coloring or bleaching hair. In particular, it relates to the reduction of sensory irritation caused by the presence of an oxidizing agent in certain compositions for hair coloring or discoloration.

BACKGROUND OF THE INVENTION Oxidizing dye and hair bleach usually include the use of a two-part system. One part is the lotion also called dyeing, which contains a variety of ingredients including oxidizing dye precursors, high regulator level and rheology modifiers, and in the second part, the developer contains a suitable stabilized oxidizing agent. By mixing the lotion and the developer, the decolourising / oxidizing dye chemistry is started. For the convenience of the consumer, the two compositions are usually formulated as thin liquids to facilitate their mixing, once mixed they form a thickened liquid solution such as a lotion, cream or gel. It is well known that compositions for coloring or bleaching hair comprise oxidizing agents such as hydrogen peroxide. The oxidant not only serves to oxidize the primary intermediates but also destroys part of the natural melanin pigment in the hair. It is known that the effectiveness of these compositions depends to some extent on the amount of their oxidizing agent content. In use it has been discovered that, at being mixed with lotions, the developers with a higher content of oxidizing agent, will cause a sensory irritation perceived in the scalp of the user that can be described as stinging, itching, itching or burning or descriptions like these. By reducing the amount of oxidizing agent, the intensity of sensory irritation is reduced or disappears completely, however, the effectiveness of the composition is also reduced. Therefore, there remains the need to formulate thinning or dyeing lotions for thin hair, which cause little or no sensory irritation when mixed with a developer containing amounts of an oxidizing agent. In the procedures that use oxidizing dyes to color the hair certain attributes are desired: The lotions must be stable to ensure a reasonable shelf life. The composition that is formed by mixing the lotion and the developer must have rheological characteristics to allow its distribution through the mass of the hair when applying it, using a brush or with the fingers, preventing it from dripping or dripping from the hair during the stage in that the color developer acts. The composition should also be able to rinse the hair with water. The composition that is formed by mixing the lotion and the developer as applied to the hair should allow rapid diffusion of the dye precursors of the dye mixture into the hair fiber. Preferably, the lotion and developer should have comparable viscosities to facilitate mixing. The main thickener mechanism in commercial dyes for the hair is due to amphiphilic molecules that form aggregates in aqueous solution. The formation and type of these aggregates will depend on the amphiphilic molecular structures, their concentration and the nature of the surrounding environment. The most common form of amphiphilic aggregates that form in hair dyes are worm-shaped micelles or lamellar phases [See descriptions in the Polísh Journal of Pharmacology, 1999, 51, 211-222, ISSN 1230-6002]. Hair dyes thickened in the form of micelles form an isotropic, viscous gel to be applied to the hair, while thickened lamellar phase hair dyes form a viscous anisotropic cream / gel to be applied to the hair. In both cases, thickening is eliminated in the original bottles using amphiphiles in the formulation of coloring lotion along with a significant amount of solvents, (usually greater than 20% by weight) that the consumer adds to the predominantly aqueous developer bottle to initiate thickening (thickening with thinner) in-situ immediately before applying it to the hair. It has been shown that hair dyes or bleaches based on thickened micellar thickeners produce greater sensory irritation in the skin compared to thickened lamellar phase hair dyes. Since lamellar liquid crystal aggregates are insoluble, it is possible to determine their presence by turbidimetry. To compare and contrast hair dyes or bleaching formulations, a turbidity methodology was developed in which the formulations of coloring lotions (containing the "amphiphilic" thickeners in combination with high levels of solvents to suppress the thickening in the bottles) ) are diluted in deionized water with turbidity values measured as a result of the amount of water added, to make the dilution through the developer formulations. The formulas that show a significant increase in the turbidity values with the added water are hair dyes thickened with lamellar phase (opaque creams / gels), while formulas that do not show this increase in the level of turbidity are thickened dyes of worm-shaped micelles (clear gels). For dyes or hair bleaches for lamellar phase thickeners, the amount of water required to achieve a turbidity value of 100 (% by weight of water added to the total mixture) is measured and subtracted from 100% to compute the value of the lamellar phase index (lamellar phase index = 100% - by weight of water added for a turbidity value of 100). This methodology is described in more detail below. Using this turbidity methodology, it was discovered that lamellar phase thickening hair lotions with lamellar phase indices greater than 80% cause less sensory irritation than lotions with lower lamellar phase indices. 80% Additionally, it was also found that all commercially available and tested hair coloring dye formulations had a lamellar phase index of less than 80%. However, it was shown that a lotion with a 100% index was not stable. Similarly, the compositions herein have a lamellar phase index of between 80% and less than 100%, preferably between 80% and 95%, more preferably between 82% and 92%, and most preferably between 85 % and 90%. To achieve such lotions, it has been discovered that not only the absolute level of solvent used is important, but also the type of solvent used must be taken into account. Surprisingly, it has been found that more hydrophilic solvent systems with a lower ClogP weighted value as described below offer less sensory irritation to more hydrophobic solvents with higher ClogP weighted values. The solvent systems of the present invention have a ClogP weighted value less than 0.0, preferably less than -0.1, and more preferably less than -0.3. Additionally, it has been shown that the coloring lotions or Hair bleaches of the present invention preferably have a preferred range of monoethanolamine (MEA) in their formula. Accordingly, the coloring or bleaching lotions of the hair of the present invention preferably comprise less than 3.5% by weight of MEA, preferably less than 3% of MEA, and more preferably less than 1% of MEA, or 6% by weight to 20% by weight, more preferably from 9% to 15% by weight of MEA.

BRIEF DESCRIPTION OF THE INVENTION In one embodiment, the present invention is a two-part system for coloring or bleaching hair comprising (i) a thin lotion that optionally comprises a dye including a solvent system and a surfactant system that releases a thickener by diluting it with a developer , and (ii) a developer comprising an irritant amount for the scalp of oxidizing agent, characterized in that said lotion has a lamellar phase index greater than 80% and less than 100%. In a preferred embodiment, the lotion of the system of the invention comprises a solvent system with a ClogP weighted average of less than 0.0, and less than 3% by weight of monoethanolamine (MEA). In another embodiment, the invention comprises a process for using the above system, wherein the lotion and developer are mixed to create a thickened coloring or decolorizing composition, and said thickened coloring or decolorizing composition is applied to the hair, allowed to act and then It is rinsed.

DETAILED DESCRIPTION OF THE INVENTION This invention is a hair coloring system comprising (i) a lotion and (ii) a developer. 1 - . 1 - The lotion: The lotion comprises a solvent system, a surfactant system and optionally an oxidant dye precursor, and includes a lamellar value index of greater than 80% and less than 100%. The present lotion is thin, that is to say it has a viscosity of 0.001 to 2 Pa.s (1 cps at 2000 cps), preferably 0.001 a 0. 5 Pa.s (1 cps at 500 cps) (all viscosities herein are measured at 0.63 rad / s (6 rpm) with a Brookfield DV-11 + viscometer with a T-bar mandrel at 25 ° C).

Determination of the lamellar phase index The lamellar phase index of the hair coloring dye formulations is determined by measuring the turbidity values as a function of deionized water added through a LP2000 turbidity meter available from Hanna Instruments, Bedfordshire, United Kingdom. United. For hair dyes thickened with lamellar phase, the amount of water required to reach a turbidity value of 100 (% by weight of water added to the total mixture) is measured. Then this value is subtracted from 100% to compute the lamellar phase index value (= 100% -water weight percentage to achieve a turbidity of 100). The turbidity meter is calibrated before use as detailed in the instruction manual. All measurements were taken at 25 ° C. The measurement protocol is as follows: A 50 mL beaker is thoroughly cleaned, including a pre-rinse with ethanol and then dried: 1. Weigh 20 grams (+/- 0.0015 g) of coloring dye for thin hair directly into the glass. 2. Deionized water is then added in drops to the dye and mixed at regular intervals with a glass rod for 20 seconds, making sure to detach the dye completely from the bottom of the glass and in doing so mix it properly. It is suggested to mix at intervals after adding 0.15 grams (+/- 0.0500 g) of deionized water. The aeration of the dye should be avoided by using a sonicator bath to eliminate the bubbles that are formed as necessary. 3. Immediately dispense 10 mL (to align in the cuvette) of the resulting liquid in a clean cuvette by pouring the liquid into the cuvette (Note: the cuvette is thoroughly rinsed twice with ethanol and then dried before taking the cuvettes. readings) which is then loaded into the turbidity meter. 4. After about 30 seconds, a turbidity reading is recorded, immediately after a second verification reading is made. 1. 1 - The surfactant system: The present lotion comprises from 2% to 30% by weight of the total composition of a surfactant system, preferably from 3% to 15%, most preferably from 3.5% to 10%. The surfactant system to be used in the present has the main function of creating, together with a solvent, a system that is thickened to Dilute with the developer. As described above, the surfactant system should provide a lamellar phase index value greater than 80% within the lotion formulation environment, to reduce or eliminate sensory irritation. It is well known that in aqueous solutions, certain amphiphilic molecules and combinations form liquid lamellar crystals (pure phase) which are types of mesomorphic structures between liquids, random and crystals that are periodic and in three dimensions. [See F. B. Rosevear, "Liquid Crystals: The Mesomorphic Phases of Surfactant Compositions", (J. Soc. Cosmetic Chemists, 19, 581-594 (August 19, 1968)]. These liquid lamellar crystals are formed by parallel bimolecular layers, called bilayers, submerged in water, where the groups of hydrophilic polar heads are oriented towards the aqueous environment and the hydrophobic end regions are oriented towards the center where they are protected from aqueous environments. The parallel layers of water separate the successive bilayers to create a double multilayer system. These double layers may be present dispersed in the form of vesicles (also called liposomes) wherein the double layers adopt a spherical configuration to surround the aqueous space. Liposomes comprising a single double layer are known as unilamellar vesicles (ULV), and those comprising two or more bilayers (structures similar to onion) are known as multilamellar vesicles (MLV). The ULV can be small (<100 nm in diameter) or large (> 100 nm). The MLV can have a diameter between 100 nm to > 1 mm The lamellar thickening phase bilayers of the present invention may be in the form of flat layers, unilamellar vesicles, multilamellar vesicles or combinations thereof. Many amphiphiles or surfactants are known to form bilayers depending on the degree of agglomeration of the adjacent surfactants within the aqueous solutions. This degree of agglomeration is influenced by the structure of the surfactant and by the synergisms that exist between the different surfactants within the mixed surfactant systems. As an empirical rule, the critical agglomeration factor (F) can be used to visualize the structural characteristics of the surfactant that influence the degree of the agglomerate: F = v / (a x L) where v is the volume occupied by the hydrophobic groups within the nucleus, a is the transverse area occupied by the hydrophilic groups on the surface and L is the length of the hydrophobic groups. For example, as the hydrophobic groups become more bulky the agglomeration increases. It can also be observed that the addition of co surfactants as fatty alcohols (small and v and large L) will increase the agglomeration. Without intending to be limited to theory, it is generally considered that the agglomeration parameter (F) must be greater than 0.5 and less than or equal to 1.0 for the formation of bilayers. If it is F < 0.5 the formation of micelles will be favorable and if it is F > 1.0 the formation of reverse micelles will be favorable. Illustrative classes of surfactants capable of participating in the formation of a liquid crystal lamellar structure include, but are not limited to, cationic surfactants, anionic surfactants, nonionic surfactants, quaternary ammonium surfactants and specific lipid surfactants. Specific nonionic surfactants are fatty alcohols or fatty acids or derivatives thereof or a mixture of any of these, having a chain length of about 14 to about 20 carbon atoms. These materials can be predominantly linear or can branch and be saturated or partially unsaturated Some examples include myristyl alcohol, myristic acid, cetyl alcohol, palmitic acid, cystearyl alcohol, stearyl alcohol, stearic acid, oleic acid, oleyl alcohol, arachidyl alcohol, arachidonic acid, and mixtures thereof. Other specific nonionic surfactants include condensation products of alcohols or phenols of straight or branched chain, saturated or unsaturated, primary or secondary C14 to C22 or phenols with alkylene oxide, usually ethylene oxide, generally having from 1 to 50 oxide groups of ethylene. Some examples include, but are not limited to, ceteth-1, ceteth-2, ceteth-3, ceteth-4, ceteth-5, ceteth-6, ceteth-10, ceteth-12, ceteth-14, ceteth-15, ceteth- 16, ceteth-20, ceteth-24, ceteth-25, ceteth-30, ceteareth-2, ceteareth-3, ceteareth-4, ceteareth-5, ceteareth-6, ceteareth-7, ceteareth-8, ceteareth-9, ceteareth-10, ceteareth-11, ceteareth-12, ceteareth-13, ceteareth-14, ceteareth-15, ceteareth-16, ceteareth-17, ceteareth-18, ceteareth-20, ceteareth-22, ceteareth-23, ceteareth- 24, ceteareth-25, ceteareth-27, ceteareth-28, ceteareth-29, ceteareth-30, steareth-2, steareth-3, steareth-4, steareth-5, steareth-6, steareth-7, steareth-8, steareth-10, steareth-11, steareth-13, steareth-14, steareth-15, steareth-16, steareth-20, steareth-21, steareth-25, steareth-27, steareth-30, arachideth-20, beheneth- 5, beheneth-10, beheneth-20, beheneth-25, beheneth-30, oleth-2, oleth-3, oleth-4, oleth-5, oleth-6, oleth-7, oleth-8, oleth-9, oleth-10, oleth-1 1, oleth-12, oleth-15, oleth-16, ol eth-20, oleth-23, oleth-25, oleth-30, oleth-40, oleth-44, oleth-50, pareth-3, pareth-9, pareth-12, and mixtures of these. Specific cationic surfactants include quaternary ammonium halides, such as, for example, alkyltrimethylammonium halides in which the alkyl group has from about 16 to about 22 carbon atoms, for example hexadecyltrimethylammonium chloride, cetyltrimethylammonium chloride, behenyl trimethylammonium chloride, chloride of dicetyl dimethylbenzylammonium chloride, stearyldimethylbenzylammonium, distearyl dimethyl ammonium chloride, cetylpyridinium chloride and corresponding halide salts and hydroxides. Preferred cationic surfactants are cetyltrimethylammonium chloride (CTAC) and cetyltrimethylammonium bromide (C ). CTAB 99% Fluka, CTAC 50% (Arquad 16-50, Akzo). Preferably, cationic surfactants are used from 2% to 10%, wherein CTAC and CTAB are the preferred cationic surfactants. Additionally, when monoalkyl-substituted cationic surfactants are used, it is also preferred to use cholesterol, wherein the ratio of cholesterol to the cationic surfactant ranges from 0.1: 1.0 to 1.0: 1.0, more preferably 0.5: 1.0 to 1.5: 1.0 and, with greater preference, from 0.7: 1.0 to 1.25: 1.0. The specific anionic surfactants are C16-C20 alkyl sulfonates, alkyl ether sulphonates, alkylaryl sulphonates, alkanoyl isethionates, alkyl succinates, alkyl sulfosuccinate, N-alkoyl sarcosinates, alkyl phosphates, alkyl ether phosphates, alkyl ether carboxylates and sulfonates. of alpha-olefin, especially its sodium, magnesium, ammonium and triethanolamine salts. Stabilizing liquid crystals can also be formed from lipid surfactants that include either phospholipids, ie, those based on glycerol and sphingosine, or glycolipids, ie, those based on sphingosine. It is preferred to phospholipids, wherein the preferred phospholipid is phosphatidylcholine (lecithin). Of the alcoholic entities that include the phosphoglycerides, serine, choline and ethanolamine are those that are particularly preferred and the fatty chains, those with a chain length of C14 to C24 are preferred. The fatty acid chains may be branched or unbranched, saturated or unsaturated, and, in particular, palmitic, myristic, oleic, stearic, arachidonic, linolenic, linoleic and arachidic acids are preferred. The preferred nonionic surfactants for the formation of liquid crystals in the continuous aqueous phase they are of the non-ionic type and include C16-20 fatty alcohols, C16-20 fatty acids and C11-20 fatty alcohol ethoxylates with 1 to 30 ethylene oxide groups. Specific examples include cetearyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, oleyl alcohol, ceteareth ethoxylates having between 10 and 30 ethylene oxide groups, ceteth ethoxylates having between 10 and 30 ethylene oxide groups, ethoxylates of esteareth having between 10 and 30 ethoxylates, pareth ethoxylates with between 2 and 15 ethoxylate and combinations of these. In a preferred embodiment, the C16-20 fatty alcohols and the C16-20 fatty acids are used in combination with C16-20 fatty alcohol ethoxylates in a ratio of between 10: 1 and 0.5: 1, more preferably between 6: 1 and 1: 1, and most preferably between 5: 1 and 1.5: 1. In another preferred embodiment, C 16-20 unsaturated fatty alcohols and C 16-20 unsaturated fatty acids are used in combination with C 16-20 fatty alcohol ethoxylates and C 11-15 fatty alcohol ethoxylates. The presence of crystalline double-layer, pure phase liquids can be detected by using a polarizing microscope as shown in "The Microscopy of the Liquid Crystalline Neat and Middle Phases of Soaps and Synthetic Detergents" of Crystal Liquid of Soaps and Synthetic Detergents), by FB Rosevear in The Journal of the American Oil Chemists' Society, Vol. 31, (December 1954). 1. 2 - The solvent system: The lotions herein comprise a solvent system in addition to water. As used herein, the term "solvent system" refers to systems comprising all solvents in the composition with the exception of water. The solvent system of the present has the main function of maintaining the surfactant system solubilized to a suitable degree to ensure the obtaining of a liquid it thin enough for the lotion. The solvent system of the present generally represents from 5% to 30% by weight of the composition, preferably from 15% to 27%. As described above it has been shown that it is possible to reduce sensory irritation if the solvent system used has a weighted ClogP average of less than 0.0. The ClogP scale is a convenient means to characterize the degree of hydrophobicity or hydrophilicity of a compound with its partition coefficient of octanol / water P. The octanol / water partition coefficient of a compound is the ratio between its equilibrium concentrations in octanol and in water. A compound with a partition coefficient P is more hydrophobic. Conversely, a compound with a smaller partition coefficient P is more hydrophilic. Since the partition coefficients of the compounds usually have high values, they are supplied in the form of their logarithm to the base 10, logP. The logP values are calculated using the "CLOG P" program via STN. This database uses experimental and calculated property information available from the REGISTRY file. In the REGISTRY file there are two types of experimental properties: the Chemical Abstracts Service (CAS) and the SPRESI database produced by ZIC? / INITI and offered by Infochem. The values for the physical properties calculated in the REGISTRY file were determined using the CAS connection tables and the software developed by ACD / Labs, Toronto, Canada. Information on the algorithms used to calculate property information is available from their website at http://www.acdlabs.com/. The solvent system of the present invention is preferably characterized by its weighted average ClogP, that is, the weighted average ClogP of all its components. Where the weighted average ClogP is calculated from the Following way: Weighted average ClogP = (amount of solvent A x ClogP of solvent A) + (quantity of solvent B x ClogP of solvent B) + (amount of solvent C x CloqP of solvent C) + etc. amount of solvent A + quantity of solvent B + quantity of solvent C etc.

This does not include water as a solvent. The solvent system of the present invention has a ClogP weighted average of less than 0.0, preferably less than -0.1 and more preferably less than -0.3. Suitable solvents for use in the solvent system herein include, in non-limiting form, amides, esters, ethers, ketones, cyclic amides, cyclic esters, cyclic ketones, cyclic esters, and mixtures thereof. Some non-limiting examples include ethyl formate, dimethyl isosorbide, acetylacetone, 2-butanone, acetone, methyl acetate, ethyl acetate, propyl acetate, ethoxyethanol, dipropylene glycol monomethyl ether, butyl lactate, t-butyl alcohol, phenyl, 2-propoxyethanol, isopropoxyethanol, methoxypropanol, isopropyl lactate, hexyl alcohol, butoxyethanol, tripropylene glycol (PPG-3), triacetin, methoxyethanol, isopropyl alcohol, PEG-8, methyl lactate, PEG-6, PEG-5 , PEG-4, N-methylpyrrolidone, propyl alcohol, dipropylene glycol (PPG-2), acetonitrile, phenoxyethanol, triethylene glycol, hexylene glycol, ethyl alcohol, gamma-butyrolactone, butylene glycol, propylene carbonate, dimethyl sulfoxide, diethylene glycol, ethoxydiglycol, propylene glycol, pyrrolidone, pyrrolidone-2, methyl alcohol, ethylene carbonate, ethylene glycol, acetamide, glycerin, butylcarbitol, 1,3-dioxolane, dimethoxymethane, 1,2-hexanediol, dipropylene glycol butyl ether, t-butyl dipropylene glycol ether, propionaldehyde, diethoxymethane and glycerol formate. Preferred solvents for use in the solvent system of the present they include low alkanols, C2-C6 polyols, low mono glycol alkyl ethers, low mono diglycol alkyl ethers, and N-low alkylpyrrolidones. The term "low" means that they contain 3 or less carbon atoms. Some specific examples include low alkanols such as ethanol, isopropyl alcohol, low polyols such as ethylene glycol, propylene glycol, 1,3-butanediol, diethylene glycol, glycerin; glycol monoethers such as 2-methoxyethanol and 2-ethoxyethanol; mono-low diglyceryl ethers such as methoxydiglycol, ethoxydiglycol and N-low alkyl pyrrolidones such as N-methylpyrrolidone and N-ethylpyrrolidone. The solvents described above can be used in any combination to provide a weighted average Clog P of < 0 1. 3 - Monoethanolamine level: The compositions of the present invention also comprise at least one source of alkalizing agent. However, it is preferred that the compositions herein comprise MEA in a range of less than 3.5% by weight, preferably less than 3% by weight, more preferably less than 1% by weight or between 6% to 20% by weight, more preferably from 9% by weight to 15% by weight of MEA. It is also possible to use any other agent known in the industry as alkanolamides in place of monoethanolamine, such as, for example, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tri-propanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino- 2-methyl-1-propanol, and 2-amino-2-hydroxymethyl-1,3-propanediol and guanidium salts. In particular, the preferred alkalizing agents are those that provide a source of ammonium ions. Any source of ammonium ions is suitable for use in the present. Preferred sources include ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium phosphate, ammonium acetate, ammonium carbonate, hydrogen ammonium carbonate, ammonium carbamate, ammonium hydroxide, ammonia and mixtures of these. Ammonium carbonate and ammonia are particularly preferred. The compositions of the present invention may comprise from about 0.1% to about 10% by weight, preferably from about 0.5% to about 5%, most preferably from about 1% to about 3% of a alkanilizing agent, preferably ions ammonium.

DH The lotion of the present invention has a pH of up to 11.0 included. Preferably, the lotion of the present invention has a pH of 9 to 11, more preferably 10.5 to 11.0. 1. 4 Oxidizing coloring precursor: The present lotion can be formulated as a lotion for hair bleaching or as a hair coloring lotion. Said coloring lotion will also comprise precursors of hair oxidant dyes or mixtures of these (also known as primary intermediates) which will provide the hair with a variety of colors. These precursors are activated by the oxidizing agent that is present in the developer described hereafter and react with more molecules to form a complex with larger colors in the hair shaft. The lotion comprises between 0% and 10% of oxidative coloring precursors, preferably between 0.1 and 5%, and more preferably between 0.2 and 3%. The chemical nature of the oxidant dye precursors contained in the lotion does not impact the lamellar phase index significantly. The precursors may be used alone or in combination with other precursors, and one or more may be used in combination with one or more coupling agents. Coupling agents (also known as color modifiers or secondary intermediates) are usually colorless molecules that can form colors in the presence of activated precursors, and are used with other precursors or coupling agents to generate specific color effects or to stabilize the color. The choice of precursors and coupling agents will be determined by the color, tone and intensity of the coloration desired. Herein, precursors and coupling agents can be used, either alone or in combination, to provide dyes having a variety of shades, ranging from tan blond to black. These compounds are well known in the industry and include aromatic diamines, aminophenols and their derivatives (a representative but non-exhaustive list of oxidation dye precursors can be found in Sagarin: Cosmetic Science and Technology, Interscience, Special Edition, Vol. 2 pp. 308 a 310). It should be understood that the precursors listed below are examples and that it is not intended to limit the compositions and processes herein. Suitable developers for use in the compositions described herein include, but are not limited to, p-phenylenediamine derivatives, for example, benzene-1,4-diamine (commonly known as p-phenylenediamine), 2-methylbenzene-1, 4 -diamine, 2-chlorobenzene-1,4-diamine, N-phenyl-benzene-1,4-diamine, N- (2-ethoxyethyl) benzene-1,4-diamine, 2 - [(4-aminophenyl) - ( 2-hydroxyethyl) -amino] -ethanol, (commonly known as N, N-bis (2-hydroxyethyl) -p-phenylenediamine) (2,5-diaminophenyl) -methanol, 1- (2'- hydroxyethyl) -2,5-diaminobenzene, 2- (2,5-diaminophenyl) -ethanol, N- (4-aminophenyl) benzene-1,4-diamine, 2,6-dimethylbenzene-1,4-diamine, 2- isopropyl-benzene-1,4-diamine, 1 - [(4-aminophenyl) amino] -propan-2-ol, 2-propyl-benzene-1,4-diamine, 1,3-bis [(4-aminophenyl)] (2-hydroxyethyl) amino] propan-2-ol, N, N, 2-thmethylbenzene-1,4-diamine, 2-methoxybenzene-1,4-diamine, 1- (2,5-diaminophenyl) ethane-1, 2-diol, 2,3-dimethylbenzene-1,4-diamine, N- (4-amino-3-hydroxyphenyl) -acetamide, 2,6-diethylbenzene-1,4-diamine, 2,5-dimethylbenzene-1, 4-diamine, 2-thien-2-ylbenzene-1,4-diamine, 2-thien-3-ylbenzene-1,4-diamine, 2-pyridin-3-ylbenzene-1,4-diamine, 1 ' -biphenyl-2,5-diamine, 2- (methoxymethyl) benzene-1,4-diamine, 2- (aminomethyl) benzene-1,4-diamine, 2- (2,5-diaminophenoxy) ethanol, N- [2 - (2,5-diaminophenoxy) ethyl] -acetamide, N, N-dimethylbenzene-1,4-diamine, N, N-diethylbenzene-1,4-diamine, N, N-dipropylbenzene-1,4-diamine, - [(4-aminophenyl) (ethyl) amino] ethanol, 2 - [(4-amino-3-methyl-phenyl) - (2-hydroxyethyl) -amino] -ethanol, N- (2-methoxyethyl) -benzene-1,4-diamine, 3 - [(4-aminophenyl) amino] propan-1-ol, 3 - [(4-aminophenyl) -amino] propane-1,2-diol, N -. { 4 - [(4-aminophenyl) amino] butyl} benzene-1, 4-diamine, and 2- [2- (2- { 2 - [(2,5-diaminophenyl) -oxy] ethoxy} ethoxy) ethoxy] benzene-1,4-diamine; 1, 3-Bis (N (2-hydroxyethyl) -N- (4-aminophenyl) amino) -2-propanol; 2,2 '- [1,2-ethanediyl-bis- (oxy-2,1-ethanediyloxy)] - bis-benzene-1,4-diamine; N, N-bis (2-hydroxyethyl) -p-phenyl-indiamine; p-aminophenol derivatives such as: 4-aminophenol (commonly known as p-aminophenol), 4-methylaminophenol, 4-amino-3-methylphenol, 4-amino-2-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-1-hydroxy-2- (2'-hydroxyethylaminomethyl) benzene, 4-amino-2-methoxymethylphenol, 5-amino-2-hydroxybenzoic acid, 1- (5-amino-2-hydroxyphenyl) -ethane -1,2-diol, 4-amino-2- (2-hydroxyethyl) -phenol, 4-amino-3- (hydroxymethyl) phenol, 4-amino-3-fluoro-phenol, 4-amino-2- (aminomethyl) ) -phenol, 4-amino-2-fluoro-phenol; 1-hydroxy-2,4-d-aminobenzene; 1- (2'-hydroxyethyloxy) -2,4-diaminobenzene; 2,4-diamino-5-methylfenetol; o-phenylenediamine derivatives such as: 3,4-diaminobenzoic acid and salts thereof; o-aminophenol derivatives such as: 2- amiphenol (commonly known as o-aminophenol), 2,4-diaminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol, N- (4-amino-3-hydroxyphenyl) -acetamide, and 2-amino -4-methylphenol; and heterocyclic derivatives such as: pyrimidine-2,4,5,6-tetramine (commonly known as 2,4,5,6-tetraaminopihdine), 1-methyl-1 H-pyrazole-4,5-diamine, 2- ( 4,5-diamino-1 H-pyrazol-1-yl) ethanol, N 2, N 2 -dimethylpyridine-2,5-diamine, 2 - [(3-amino-6-methoxypyridin-2-yl) amino] ethanol, 6 -methoxy-N2-methyl-pihdine-2,3-diamine, 2,5,6-triaminopyrimidin-4 (1 H) -one, pyridine-2,5-diamine, 1-isopropyl-1 H-pyrazole-4, 5-diamine, 1- (4-methylbenzyl) -1 H -pyrrazole-4,5-diamine, 1 - (benzyl) -1H-pyrazole-4,5-diamine, 1- (4-chlorobenzyl) -1 H -pyrazol-4,5-diamine, pyrazolo [1,5-a] -pyrimidine-3,7-diamine, 5,6,7-trimethylpyrazolo [1,5-a] pyrimidin-3-alamine hydrochloride, hydrochloride of 7-methylprazole [1,5-a] pyridin-3-ylamine, 2,5,6,7-teramethyl-pyrazolo [1,5-a] pyrimidin-3-ylamine hydrochloride, hydrochloride of 5,7-di-tert-butylpyrazolo [1,5-a] pyrimidin-3-ylamine, 5,7-di-thfluoromethyl-pyrazolo [1,5-a] pyrimidin-3-ylamine hydrochloride, hydrochloride of 2 -methylpyrazolo [1, 5-a] pyrimidine-3,7-diamine; 4-hydroxy-2,5,6-triaminopyrimidine; 1- (2'-hydroxyethyl) -amino-3,4-methylenedioxybenzene; and 1-hydroxyethyl-4,5-diaminopyrazole sulfate. Other developers are selected from the group comprising N- (3-furylmethyl) benzene-1,4-diamine; N-thiophen-3-ylmethyl-benzene-1,4-diamine; N- (2-fuhylmethyl) benzene-1,4-diamine; N-thiophen-2-ylmethyl-benzene-1,4-diamine; 4-hydroxybenzoic acid (2,5-diamino-benzylidene) -hydrazide; 3- (2,5-diaminophenyl) -N-ethyl-acrylamide; 2- [3- (3-Amino-phenylamino) -propenyl] -benzene-1,4-diamine; 2- [3- (4-amino-phenylamino) -propenyl] -benzene-1,4-diamine; 2- (6-methyl-pyridin-2-yl) -benzene-1,4-diamine; 2-pyridin-2-ylbenzene-1,4-diamine; 2- [3- (4-amino-phenylamino) -propenyl] -benzene-1,4-diamine; 2- [3- (3-Amino-phenylamino) -propenyl] -benzene-1,4-diamine; 3- (2,5-diaminophenyl) -N-ethyl-achlamide; 2-thiazol-2-ylbenzene-1,4-diamine; 4-hydroxybenzoic acid (2,5-diamino-benzylidene) -hydrazide; 3'-fluoro-biphenyl-2,5-diamine; 2-propenylbenzene-1,4-diamine; 2'-chloro-biphenyl-2,5-diamine; N- thiophen-3-ylmethyl-benzene-1,4-diamine; N- (3-fuhylmethyl) benzene-1,4-diamine; 4'-methoxy-biphenyl-2,5-diamine; N- (4-amino-benzyl) -benzene-1,4-diamine; 2-methyl-5 - [(1-H-pyrrol-2-ylmethyl) -amino] -phenol; 5 - [(furan-2-ylmethyl) -amino] -2-methylphenol; 5-isopropylamino-2-methylphenol; biphenyl-2,4,4'-triamine hydrochloride; 5- (4-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; 5-phenylaminomethyl-benzene-1,3-diamine hydrochloride; 2- [4-amino-2- (3,5-diamino-benzylamino) -phenoxy] -ethanol hydrochloride; 5- (3-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; N- (2-amino-benzyl) -benzene-1,3-diamine hydrochloride; N-furan-2-ylmethyl-benzene-1,3-diamine hydrochloride; 2 - [(3-amino-phenylamino) -methyl] -phenol hydrochloride; 4-amino-2-propylaminomethyl-phenol; hydrochloride; N-benzo [1,3] dioxol-5-ylmethyl-benzene-1,3-diamine hydrochloride; N- [4-amino-2- (2-hydroxyethyl) -2H-pyrazol-3-yl] -3- (5-amino-2-hydroxyphenyl) -acrylamide; hydrochloride; 4-amino-2- (isopropylamino-methyl) -phenol; hydrochloride; 4-thiophen-3-ylbenzene-1,3-diamine; hydrochloride hydrochloride; 5-phenylaminomethyl-benzene-1,3-diamine hydrochloride; 5- (3-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; 4-thiophen-3-ylbenzene-1,3-diamine; hydrochloride; 2 ', 4'-diamino-biphenyl-4-ol; hydrochloride; 5-cyclobutylamino-2-methylphenol; 5-cyclobutylamino-2-methylphenol; 4-amino-2- (pihdin-3-ylaminomethyl) -phenol; 5- (3-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; 5-allylaminomethyl-benzene-1,3-diamine hydrochloride; N- (4-amino-benzyl) -benzene-1,3-diamine hydrochloride; N-benzyl hydrochloride; benzylbenzene-1,3-diamine; 3 - [(3-amino-phenylamino) -methyl] -phenol hydrochloride; N- (4-methoxy-benzyl) -benzene-1,3-diamine hydrochloride; N-thiophen-2-ylmethyl-benzene-1,3-diamine hydrochloride; 4-amino-2 - [(2-hydroxy-5-nitro-phenylamino) -methyl] -phenol; hydrochloride; 2 ', 4'-diamino-biphenyl-4-ol hydrochloride; biphenyl-2,4,4'-triamine; 5- (4-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; 2- [4-amino-2- (3,5-diamino-benzylamino) -phenoxy] -ethanol hydrochloride; 5-allylaminomethyl-benzene-1,3-diamine hydrochloride; 5- (3-aminophenyl) aminomethyl-benzene-1,3-diamine hydrochloride; N- (4-amino-benzyl) -benzene-1,3-diamine hydrochloride; N-benzyl hydrochloride; benzylbenzene-1,3-diamine; 3- hydrochloride [(3-amino-phenylamino) -methyl] -phenol; N- (2-amino-benzyl) -benzene-1,3-diamine hydrochloride; N- (4-methoxy-benzyl) -benzene-1,3-diamine hydrochloride; N-furan-2-ylmethyl-benzene-1,3-diamine hydrochloride; 2 - [(3-amino-phenylamino) -methyl] -phenol hydrochloride; N-thiophen-2-ylmethyl-benzene-1,3-diamine hydrochloride; N-benzo [1,3] dioxol-5-ylmethyl-benzene-1,3-diamine hydrochloride; N- [4-amino-2- (2-hydroxyethyl) -2H-pyrazol-3-yl] -3- (5-amino-2-hydroxyphenyl) -acrylamide hydrochloride; 4-amino-2-propylaminomethyl-phenol; hydrochloride; 4-amino-2- (isopropylamino-methyl) -phenol hydrochloride; 4-amino-2 - [(2-hydroxy-5-nitro-phenylamino) -methyl] -phenol hydrochloride; 2-methyl-5 - [(1 -H-pyrrol-2-ylmethyl) -amino] -phenol; 5 - [(furan-2-ylmethyl) -amino] -2-methylphenol; 5-isopropylamino-2-methylphenol; 5-cyclobutylamino-2-methylphenol; 4-amino-2- (pyridin-3-ylaminomethyl) -phenol; and 5-cyclobutylamino-2-methylphenol. Preferred developers include, but are not limited to: p-phenylenediamine derivatives such as 2-methylbenzene-1,4-diamine; benzene-1, 4-diamine; 1- (2,5-diaminophenyl) -ethanol; 2- (2,5-diaminophenyl) -ethanol; N- (2-methoxyethyl) benzene-1,4-diamine; 2 - [(4-aminophenyl) - (2-hydroxyethyl) -amino] -ethanol; 1- (2,5-diaminophenyl) ethane-1,2-diol; 1- (2'-hydroxyethyl) -2,5-diaminobenzene; 1,3-Bis (N (2-hydroxyethyl) -N- (4-aminophenyl) amino) -2-propanol; 2,2 '- [1,2-ethanediyl-bis- (oxy-2,1-ethanediyloxy)] - bis-benzene-1,4-diamine; N, N-bis (2-hydroxyethyl) -p-phenyl-indiamine; and mixtures thereof, p-aminophenol derivatives such as: 4-aminophenol, 4-methylaminophenol, 4-amino-3-methylphenol, 4-amino-2-methoxymethylphenol; 1- (5-amino-2-hydroxyphenyl) -ethane-1,2-diol; 1-hydroxy-2,4-diaminobenzene; 1- (2'-hydroxyethyloxy) -2,4-diaminobenzene; 4-amino-2-aminomethylphenol; 2,4-diamino-5-methylfenetol; 4-amino-1-hydroxy-2- (2'-hydroxyethylaminomethyl) benzene; 1-methoxy-2-amino-4- (2'-hydroxyethylamino) benzene; 5-aminosalicylic acid and its salts; and mixtures thereof, o-phenylenediamine derivatives such as: 3,4-diaminobenzoic acid and salts thereof; o-aminophenol derivatives such as: 2-aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol, N- (4-amino-3-hydroxy-phenyl) -acetamide; 2-amino-4-methylphenol; and mixtures thereof, and heterocyclic derivatives such as: pyrimidin-2,4,5,6-tetramine; 1-methyl-1 H-pyrazole-4,5-diamine; 2- (4,5-diamino-1 H-pyrrazol-1-yl) ethanol; 1- (4-methylbenzyl) -1 H-pyrazole-4,5-diamine; 1- (benzyl) -1 H-pyrazole-4,5-diamine; N2, N2-dimethylpihdin-2,5-diamine; 4-hydroxy-2,5,6-triaminopyrimidine; 1- (2'-hydroxyethyl) -amino-3,4-methylenedioxybenzene; and 1-hydroxyethyl-4,5-diaminopyrazole sulfate; and mixtures of these. The most preferred developers include 2-methylbenzene-1,4-diamine; benzene-1, 4-diamine; N, N-bis (2-hydroxyethyl) -p-phenylenediamine; 4-aminophenol; 4-methylaminophenol; 4-amino-3-methylphenol; 1-hydroxy-2,4-diaminobenzene; 2-aminophenol; 2-amino-5-methylphenol; 2-amino-6-methylphenol; 1-methyl-1 H-pyrazole-4,5-diamine; 1-hydroxyethyl-4,5-diaminopyrazole sulfate; 2- (4,5-diamino-1 H-pyrazol-1-yl) ethanol; and mixtures of these. Suitable coupling agents for use in the compositions described herein include, but are not limited to, phenols, resorcinol and naphthol derivatives such as naphthalene-1,7-diol, benzene-1,3-diol, 4-chlorobenzene- 1,3-diol, naphthalene-1-ol, 2-methylnaphthalene-1-ol, naphthalene-1,5-diol, naphthalene-2,7-diol, benzene-1,4-diol, 2-methylbenzene-1, 3-diol, 7-amino-4-hydroxynaphthalene-2-sulfonic acid, 2-isopropyl-5-methylphenol, 1, 2,3,4-tetrahydro-naphthalene-1, 5-diol, 2-chlorobenzene-1 acid, 3-diol, 4-hydroxynaphthalene-1-suphonic acid, benzene-1, 2,3-triol, naphthalene-2,3-diol, 5-dichloro-2-methylbenzene-1,3-diol, 4,6-dichlorobenzene -1, 3-diol and 2,3-dihydroxy- [1,4] naphthoquinone; and 1-acetoxy-2-methylnaphthalene; m-phenylenediamines such as: 2,4-diaminophenol, benzene-1,3-diamine, 2- (2,4-diaminophenoxy) -ethanol, 2 - [(3-aminophenyl) - (2-hydroxyethyl) -amino] Ethanol, 2-methylbenzene-1,3-diamine, 2 - [[2- (2,4-diaminophenoxy) -ethyl] - (2-hydroxyethyl) -amino] -ethanol, 4-. { 3 - [(2,4-diaminophenyl) oxy] propoxy} benzene- 1, 3-diamine, 2- (2,4-diaminophenyl) -ethanol, 2- (3-amino-4-methoxyphenylamino) -ethanol, 4- (2-aminoethoxy) -benzene-1,3-diamine, (2,4-diaminophenoxy) -acetic acid, 2- [2,4-diamino-5- (2-hydroxy-ethoxy) -phenoxy] -ethanol, 4-ethoxy-6-methylbenzene-1,3-diamine, 2 - (2,4-diamino-5-methyl-phenoxy) -ethanol, 4,6-dimethoxybenzene-1,3-diamine, 2- [3- (2-hydroxyethylamino) -2-methylphenylamino] -ethanol, 3- ( 2,4-diaminophenoxy) -propan-1-ol, N- [3- (dimethylamino) phenyl] urea, 4- methoxy-6-methylbenzene-1,3-diamine, 4-fluoro-6-methylbenzene-1,3-diamine, 2- (. {3 - [(2-hydroxyethyl) amino] -4,6-dimethoxyphenyl} . -amino) ethanol, 3- (2,4-diaminophenoxy) -propane-1,2-diol, 2- [2-amino-4- (methylamino) -phenoxy] ethanol, 2 - [(5-amino-2 -ethoxy-phenyl) - (2-hydroxyethyl) -amino] -ethanol, 2 - [(3-aminophenyl) amino] ethanol, 2,4-diamino-5- (2'-hydroxyethyloxy) toluene; N, N-dimethyl-3-ureidoaniline; N- (2-aminoethyl) benzene-1,3-diamine, 4-. { [(2,4-diaminophenyl) oxy] methoxy} -benzene-1, 3-diamine, 1-methyl-2,6-bis (2-hydroxyethylamino) benzene; and 2,4-dimethoxybenzene-1,3-diamine; m-aminophenols such as: 3-aminophenol, 2- (3-hydroxy-4-methylphenylamino) -acetamide, 2- (3-hydroxyphenylamino) -acetamide, 5-amino-2-methylphenol, 5- (2-hydroxyethylamino) - 2-methylphenol, 5-amino-2,4-dichlorophenol, 3-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 5-amino-2- (2-hydroxy-ethoxy) -phenol, 2-chloro-5- (2,2,2-trifluoro-ethylamino) -phenol, 5-amino-4-chloro-2-methylphenol, 3-cyclopentylaminophenol, 5 - [(2-hydroxyethyl) amino] -4-methoxy -2-methylphenol, 5-amino-4-methoxy-2-methylphenol, 3- (dimethylamino) phenol, 3- (diethylamino) phenol, 5-amino-4-fluoro-2-methylphenol, 5-amino-4-ethoxy -2-methylphenol, 3-amino-2,4-dichlorophenol, 3 - [(2-methoxyethyl) amino] phenol, 3 - [(2-hydroxyethyl) amino] phenol, 5-amino-2-ethyl-phenol, -amino-2-methoxyphenol, 5 - [(3-hydroxypropyl) amino] -2-methylphenol, 3 - [(3-hydroxy-2-methylphenyl) -amino] propane-1,2-diol and 3 - [(2 -hydroxyethyl) amino] -2-methylphenol, and 1-methyl-2-hydroxy-4- (2'-hydroxyethyl) aminobenzene; 1,3-bis- (2,4-diaminophenoxy) propane; 1-hydroxy-2-methyl-5-amino-6-chlorobenzene; and heterocyclic derivatives such as: 3,4-dihydro-2H-1,4-benzoxazin-6-ol, 4-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, 6-methoxyquinolin-8-amine, 4-methylpihdine-2,6-diol, 2,3-dihydro-1,4-benzodioxin-5-ol, 1,3-benzodioxol-5-ol, 2- (1, 3 -benzodioxol-5-ylamino) ethanol, 3,4-dimethylpyridine-2,6-diol, 5-chloropyridine-2,3-diol, 2,6-dimethoxypyridine-3,5-diamine, 1,3-benzodioxol-5-amine, 2-. { [3,5-diamino-6- (2-hydroxy-ethoxy) -pyridin-2-yl] oxy} -ethanol, 1H-indol-4-ol, 5-amino-2,6-dimethoxypyridin-3-ol, 1 H-indole-5,6-diol, 1 H-indole-7-ol, 1 H-indole 5-ol, 1 H-indol-6-ol, 6-bromo-1,3-benzodioxol-5-ol, 2-aminopyridin-3-ol, pyridine-2,6-diamine, 3 - [(3.5 -diaminopihdin-2-yl) oxy] propane-1,2-diol, 5 - [(3,5-diaminopyridin-2-yl) oxy] pentane-1,3-diol, 1 H- indole-2,3-dione, indoline-5,6-diol, 3,5-dimethoxypydine-2,6-diamine, 6-methoxypydine-2,3-diamine; 3,4-dihydro-2H-1,4-benzoxazin-6-amine; 4-hydroxy-N-methylindol, 1 H-5-methylpyrazol-5-one, 1-phenyl-3-methylpyrazol-5-one, 2,6-dimethylpyrazolo [1,5-b] -1, 2,4- triazole, 2,6-dimethyl [3,2-c] -1, 2,4-triazole, 6-methylpyrazolo- [1,5-a] benzimidazole, 2,6-dihydroxypyridine, 2,6-dihydroxy-3, 4-dimethylpyridine, 5-methylpyrazolo [5,1-e] -1, 2,3-thazole, 5-methyl-6-chloropyrazolo [5,1-e] -1, 2,3, -triazole, -Phenylpyrazolo [5,1-e] -1,3,3-triazole and its addition salts, 1 H-2,6-dimethylpyrazolo [1, 5-b] -1, 2,4-triazole tosylate, 7, 8-dicyano-4-methylimidazole- [3,2-a] imidazole, 2,7-dimethylpyrazolo [1,5-a] pyrimidin-5-one, 2,5-dimethylpyrazolo [1,5-a] pyrimidine-7 -one, and 2-methyl-5-methoxymethyl-pyrazolo [1,5-a] pyrimidin-7-one; 6-hydroxybenzomorpholine; and 3-amino-2-methylamino-6-methoxypyridine; 1-Phenyl-3-methyl-5-pyrazolone-2,4-dihydro-5,2-phenyl-3H-pyrazol-3-one. Preferred coupling agents include, but are not limited to, phenol, resorcinol, and naphthol derivatives such as naphthalene-1,7-diol, benzene-1,3-diol, 4-chlorobenzene-1,3-diol, naphthalene -1-ol, 2-methylnaphthalene-1-ol, naphthalene-1, 5-diol, naphthalene-2,7-diol, benzene-1,4-diol, 2-methylbenzene-1,3-diol and 2-isopropyl -5-methylphenol; 1, 2,4-trihydroxybenzene; 1-acetoxy-2-methylnaphthalene; and mixtures of these; m-phenylenediamine derivatives such as: benzene-1,3-diamine, 2- (2,4-diaminophenoxy) -ethanol, 4-. { 3 - [(2,4-diaminophenyl) oxy] propoxy} benzene-1, 3-diamine, 2- (3-amino-4-methoxyphenylamino) -ethanol, 2- [2,4-diamino-5- (2-hydroxy-ethoxy) -phenoxy] -ethanol and 3- (2 , 4-diaminophenoxy) -propane-1-ol; 2,4-diamino-5- (2'-hydroxyethyloxy) toluene; N, N-dimethyl-3-ureidoaniline; 2,4-diamino-5-fluorotoluene sulfate hydrate; 1-methyl-2,6-bis (2-hydroxyethylamino) benzene; and mixtures thereof, m-aminophenol derivatives, such as: 3-aminophenol, 5-amino-2-methylphenol, 5- (2-hydroxyethylamino) -2-methylphenol, and 3-amino-2-methylphenol; 1-methyl-2-hydroxy-4- (2'-hydroxyethyl) aminobenzene; 1-hydroxy-3-amino-2,4-dichlorobenzene; 1,3-bis- (2,4-diaminophenoxy) propane; 1-hydroxy-2-methyl-5-amine-6-chlorobenzene; 5-amino-4-chloro-2-methylphenol; and mixtures thereof, and heterocyclic derivatives such as: 3,4-dihydro-2H-1,4-benzoxazin-6-ol, 4-methyl-2-phenyl-2,4-dihydro-3H- pyrazol-3-one, 1,3-benzodioxol-5-ol, 1,3-benzodioxol-5-amine, 1 H-indol-4-ol, 1H-indole-5,6-diol, 1 H-indole 7-ol, 1 H-indol-5-ol, 1 H-indol-6-ol, 1 H-indole-2,3-dione, pyridine-2,6-diamine, 2-aminopyridin-3-ol, 4 -hydroxy-N-methylindol, 1 H-5-methylpyrazol-5-one, 1-phenyl-3-methylpyrazol-5-one, 2,6-dimethylpyrazolo [1, 5-b] -1, 2,4-triazole , 2,6-dimethyl [3,2-c] -1, 2,4-triazole, 6-methylpyrazolo- [1, 5-a] benzimidazole; 2,6-dihydroxypyridine; 2,6-dihydroxy-3,4-dimethylpyridine; 6-hydroxybenzomorpholine; 2,6-dihydroxy-3,4-dimethylpyridine; 3,5-diamino-2,6-dimethoxypyridine; 3-amino-2-methylamino-6-methoxypyridine; 1-phenyl-3-methyl-5-pyrazolone-2,4-dihydro-5,2-phenyl-3H-pyrazol-3-one; and mixtures of these. More preferred coupling agents include: benzene-1,3-diol; 4-chlorobenzene-1,3-diol; 2-methylbenzene-1,3-diol; benzene-1, 3-diamine; 3-aminophenol; 5-amino-2-methylphenol; 1-methyl-2-hydroxy-4- (2'-hydroxyethyl) aminobenzene; 4-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one; 2-aminopyridin-3-ol; 1-phenyl-3-methylpyrazol-5-one; 1-phenyl-3-methyl-5-pyrazolone-2,4-dihydro-5,2-phenyl-3H-pyrazol-3-one; and mixtures of these. Generally, the hair coloring compositions will comprise from about 0.001% to about 10% dyes. For example, compositions that provide low intensity dyeing such as shades of natural blond to light brown generally comprise from about 0.001% to about 5%, preferably from about 0.1% to about 2%, more preferably about 0.2% to about 1% by weight of the dyeing compositions of precursors and coupling agents. Darker shades such as chestnuts and blacks generally comprise from 0.001% to about 10% by weight, preferably from about 0.05% to about 7% by weight, more preferably from about 1% to about 5% of precursors and agents of coupling In the modality in which the lotion is a bleaching lotion, there is no oxidizing dyes. In this case, the lotion provides an alkalizing source that elevates and regulates the pH of the developer, producing active decolouring species and contributing to the penetration of the fiber. 2 - . 2 - The developer: The developer comprises a quantity of irritant oxidizing agent for the scalp in an aqueous matrix. The developer of the present invention has a viscosity of 0.001 to 5 Pa.s (1 cps at 5000 cps), preferably 0.001 to 0.5 Pa.s (1 cps at 500 cps) (all viscosities herein are measured at 6 rpm. with a Brookfield DV-11 + viscometer with a T-bar mandrel at 25 ° C), and its viscosity can be adjusted before blending the lotion by the use of resistant conventional thickeners in an oxidizing environment. 2. 1 - Oxidizing agent: The developer of the present invention comprises an amount of irritant oxidizing agent for the scalp. Preferred oxidizing agents for use herein are water soluble peroxygen oxidizing agents. "Soluble in water" as defined herein means that under standard conditions at least 0.1 g, preferably 1 g, more preferably 10 g of said oxidizing agent can be dissolved in 1 liter of deionized water. The oxidizing agents are valuable compounds for the initial solubilization and discoloration of the melanin (bleached) and for accelerating the polymerization of the oxidant dye precursors (oxidative dyeing) in the hair body. Water-soluble oxidizing agents are inorganic peroxygen compounds capable of producing hydrogen peroxide in an aqueous solution.

Water-soluble peroxygen oxidizing agents are well known in the industry and include hydrogen peroxide, inorganic peroxides, alkali metals, such as sodium periodate and sodium peroxide, and organic peroxides, such as urea peroxide, melamine peroxide and salt bleaching compounds. inorganic perhydrate, as alkali metal salts of perborates, percarbonates, perfosphates, persilicates, persulfates and the like. These inorganic perhydrated salts can be incorporated as monohydrates, tetrahydrates, etc. If desired, mixtures of two or more of these oxidizing agents can be used. In accordance with the present invention, it is preferred to use hydrogen peroxide, percarbonate, persulphates and combinations thereof in the compositions. Some examples of oxidizing agents include hydrogen peroxide, peroxyurea, peroxymelamine, sodium perborate, potassium perborate, sodium percarbonate, potassium perborate, sodium percarbonate and potassium percarbonate with hydrogen peroxide being the most preferred. In accordance with the present invention, the compositions comprise more than 3% activity, preferably more than 3.5% activity and most preferably more than 4.5% activity of an oxidizing agent. Another preferred agent for use herein is a source of peroxymonocarbonate ions. Preferably, said source is formed in situ from a source of hydrogen peroxide and a source of hydrogen carbonate ions. Said oxidizing agent has been shown to be effective at a pH of up to 9.5, preferably from 7.5 to 9.5, more preferably approximately pH 9. Additionally, this system is also particularly effective in combination with a source of ammonia or ammonium ions. It has been shown that this oxidizing agent can improve the desired hair color results, particularly by highlighting the color while reducing odor, irritation to the skin and scalp and damage to the hair fibers.

Consequently, it is possible to use any ion source. Suitable sources for use herein include sodium, potassium, guanidine, arginine, lithium, calcium, magnesium, barium, ammonium salts of carbonate, carbamate and hydrocarbonate ions and mixtures of these as sodium carbonate, sodium hydrogen carbonate , potassium carbonate, potassium hydrogen carbonate, guanidine carbonate, guanidine hydrogen carbonate, lithium carbonate, calcium carbonate, magnesium carbonate, barium carbonate, ammonium carbonate, ammonium hydrogen carbonate and mixtures thereof. The percarbonate salts can also be used to provide both the carbonate ion source and the oxidizing agent. The preferred sources of carbonate ions, carbamate and hydrocarbon ions are sodium hydrogen carbonate, hydrogen hydrogen carbonate, ammonium carbamate and mixtures thereof. According to the present invention, the compositions comprise from about 0.1% to about 15% by weight, preferably from about 1% to about 10% by weight, and more preferably from about 1% to about 8% by weight of an ion hydrogen carbonate and from about 0.1% to about 10% by weight, preferably from about 1% to about 7% by weight, and most preferably from about 2% to about 5% by weight of a source of hydrogen peroxide. 2. 2 - Source of alkalizing agent: According to the present invention the composition also comprises at least one source of alkanilizing agent, preferably a source of ammonium and ammonia ions. Any agent known in the industry can be used such as alkanolamides, for example monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2- hydroxymethyl-1,3-propanediol and guanidinium salts. In particular, the preferred alkalizing agents are those that provide a source of ammonium ions. Any source of ammonium ions is suitable for use in the present.

Preferred sources include ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium phosphate, ammonium acetate, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbamate, ammonium hydroxide, percarbonate salts, ammonia and mixtures of these . Particular preference is given to ammonium carbonate, ammonium carbamate, ammonia and mixtures thereof. The compositions of the present invention may comprise from about 0.1% to about 10% by weight, preferably from about 0.5% to about 5%, most preferably from about 1% to about 3% of a alkanilizing agent, preferably ions ammonium. 2. 3-PH: The developer of the present invention has a pH of up to 3.5. Preferably, the developer of the present invention has a pH of 2.4 to 3.1. 2. 4 - Additional components: The compositions of the present invention may comprise additional ingredients including in non-restrictive form, enzymes, radical scavengers, conditioning agents, carriers, antioxidants (such as erythorbic acid, sodium metabisulfite, tocopherol acetate, tocopherol) ), stabilizers, chelators, permeant actives, perfume, reducing agents (thiolactic acid), hair bulking agents and / or polymers. It is also possible to use other miscellaneous surfactants within the surfactant system as long as a lamellar phase index greater than 80% is reached within the lotion formulation environment. These include different varieties of non-ionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and zwitterionic surfactants. Non-ionic miscellaneous surfactants that can be used include, in nonrestrictive form, trideceth-6, ceteth-10, laureth-9, octoxinol-9, nonoxynol-12, poloxamer, trideceth-12, oleth-20, and polysorbate-20. In "emulsifiers and detergents" of Me Cutcheon, North American and International Editions, MC Publishing Co., Glen Rock NJ, pages 235-246 (1993) various nonionic surfactants are listed. Exemplary miscellaneous cationic surfactants include, but are not limited to, lauryldimethylamine oxide, stearyldimethylamine oxide, cocoamidopropyl dimethylamine oxide, stearamidopropyl dimethylamine, isoalkylamidopropylethylimonium ethosulfate of C14-20, sodium alkylamidopropylethylimonium ethosulfate of C18-22, cocamidopropildimonial hydroxypropylamino hydrolysed animal protein, hydroxyanthraquinone methosulfate amidopropylmethylmorpholinium, oleamidopropylethylimonium ethosulfate, amidopropylbenzyldimonium chloride from rapeseed, rapeseed amidopropylethimonium ethosulfate, ricinoleamidopropylethylimoniate ethosulfate, soyamidopropylbenzyldimonium chloride, soyamidopropylethylimonium ethosulfate, stearamidopropalkonium chloride , stearamidopropylacetearyldimonium tosylate and mixtures thereof. Miscellaneous anionic surfactants, include, but are not limited to, compounds of the classes known as alkyl sulphates, alkyl ether sulphates, sulfates of alkylamide, alkylamide sulfate esters, alkyl ether sulphonates, alkylamide sulfonates, alkyl carbonate sulfate esters, alkyl ether ether carboxylates, fatty acids, soaps, alkylsulfosuccinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, sarcosinates, alkyl phosphates, nonoxynol phosphates or octoxynol, taurates, fatty taurides, sulphated monoglycerides, amidopolyoxyethylene sulfates of fatty acid, isethionates and mixtures thereof. Typically, the anionic surfactant is present in the composition as a neutralized salt in the form of a sodium, potassium, lithium, ammonium, alkylammonium or hydroxyalkylammonium salt, wherein the alkyl entity includes from one to about three carbon atoms. Miscellaneous amphoteric surfactants include, but are not limited to, cocoamidopropyldimethylbetaine, cocoamidopropylhydroxysultaine, cocodimethylbetaine, cocoimidazoline dicarboxylate, cocoimidazoline monocarboxylate, cocobetaine, lapirium chloride, lauryl sultaine, decylbetaine, oleamidopropylbetaine, tallowamidopropylbetaine, sodium caprophylate, sodium acetate, sodium lauroamphoacetate, sodium cocoampropylsulfonate, numerous other alkylamidoalkylamines and betaines listed in the CTFA Cosmetic Ingredient Handbook, first edition, 1988, pages 9, 10, 15 and 16. Many additional miscellaneous nonionic, cationic, anionic and amphoteric surfactants that may be used, described in "EMULSIFIERS AND DETERGENTS" by Me Cutcheon, 1993 ANNUAL, published by McCutcheon Division, MC Publication Co., Glen Rock, NJ, and in the CTFA Handbook. In accordance with the present invention the compositions further comprise a source of radical scavenger. As used herein, the term "radical scavenger" refers to species that can react with a radical reagent, preferably carbonate radicals, to convert the reactive radical into a less reactive species by a series of rapid reactions. Radical scavengers suitable for use herein include the compounds according to the general formula: (I): R1-Y-C (H) (R3) -R4- (C (H) (R5) -Y-R6) n wherein Y is NR2, O, or S, preferably NR2 n is 0 to 2, and wherein R is monovalent or divalent and is selected from: (a) substituted or unsubstituted, linear or branched, alkyl, alkyl systems mono- or polyunsaturated, heteroalkyl, aliphatic, heteroaliphatic or heteroolefinic systems, (b) substituted or unsubstituted mono- or polycyclic aliphatic, aryl or heterocyclic systems, or (c) substituted or unsubstituted mono, poly or perfluoroalkyl systems; the systems of (a), (b) and (c) comprise from 1 to 12 carbon atoms and from 0 to 5 heteroatoms selected from O, S, N, P, and Si; and wherein R4 can be connected to R3 or R5 to create a ring of 5, 6 or 7 members; and wherein R1, R2, R3, R5, and R6 are monovalent and are independently selected from: (a), (b) and (c) described in the foregoing, or H. Preferably, R4 is selected from: a) substituted or unsubstituted, linear or branched systems, of alkyl, heteroalkyl, aliphatic, heteroaliphatic or heteroolefinic systems, (b) unsubstituted or substituted mono- or polycyclic aliphatic, aryl or heterocyclic systems, or (c) substituted or unsubstituted systems substituted mono, poly or perfluoroalkyl; more preferably R4 is selected from (a) substituted or unsubstituted, linear or branched alkyl, heteroalkyl, aliphatic or heteroaliphatic systems, (b) substituted or unsubstituted aryl systems or heterocyclic systems, or (c) substituted or substituted systems unsubstituted mono, poly or perfluoroalkyl; more preferably substituted or unsubstituted, linear or branched alkyl or heteroalkyl systems. 3 Preferably, the R4 systems of (a), (b), and (c), described hereinabove, comprise from 1 to 8 carbon atoms, preferably from 1 to 6, more preferably from 1 to 4 carbon atoms and from 0 to 3 heteroatoms; preferably from 0 to 2 heteroatoms; most preferably from 0 to 1 heteroatoms. Where systems contain heteroatoms, they preferably contain 1 heteroatom. Preferred heteroatoms include O, S, and N; being the most preferred O, and N; and most preferred O. Preferably, R1, R2, R3, R5, and R6 are independently selected from any of the systems defined for R above, and H. In alternative embodiments, any of the groups R1, R2, R3, R4 , R 5, and R 6 are substituted. Preferably, the substituent (s) is selected from: (a) the group of monovalent substituents with C-bonds which is formed by: (i) substituted or unsubstituted, linear or branched, alkyl, mono- or polyunsaturated alkyl, heteroalkyl, aliphatic, heteroaliphatic or heteroolefinic systems, (ii) substituted or unsubstituted mono or polycyclic aliphatic, aryl or heterocyclic systems, or (iii) substituted or unsubstituted mono, poly or perfluoroalkyl systems; said systems (i), (ii) and (iii) comprise from 1 to 10 carbon atoms and 0 to 5 heteroatoms selected from the group consisting of O, S, N, P, and Si; (b) the group of monovalent substituents with S-bonds formed by SA1, SCN, SO2A1, SO3A1, SSA1, SOA1, SO2NA1A2, SNA A2, and SONA1A2; (c) the group of monovalent substituents with linkages comprising OA1, OCN and ONA1 A2; (d) the group of monovalent substituents with N bonds comprising NA1A2, (NA1A2A3) +, NC, NA1OA2, NA1SA2, NCO, NCS, NO2, N = NA1, N = NOA1, NA1CN, NA1NA2A3; (e) the group of monovalent substituents comprising COOA1, CON3, CONA2, CONA1COA2, C (= NA1) NA1A2, CHO, CHS, CN, NC, and X; and (f) the group comprising monovalent fluoroalkyl substituents formed by mono, poly or perfluoroalkyl systems comprising from 1 to 12 carbon atoms and from 0 to 4 heteroatoms.

For groups (b) to (e), described above, A1, A2, and A3 are monovalent and are independently selected from: (1) H, (2) substituted or unsubstituted, linear or branched, alkyl, alkyl systems mono- or polyunsaturated, heteroalkyl, aliphatic, heteroaliphatic or heteroolefinic systems, (3) substituted or unsubstituted mono- or polycyclic aliphatic, aryl or heterocyclic systems, or (4) substituted or unsubstituted mono-, poly- or perfluoroalkyl systems; said systems of (2), (3) and (4) comprising from 1 to 10 carbon atoms and from 0 to 5 heteroatoms selected from O, S, N, P, and Si; wherein X is a halogen selected from the group consisting of F, Cl, Br, and I. Preferred substituents for use herein include those having a Hammett Sigma Para (sp) value of -0.65 to +0.75, preferably -from 0.4 to +0.5. The Hammett Sigma values are described in the publication Advanced Organic Chemistry - Reactions, Mechanisms and Structure (Advanced reactions of organic chemistry, mechanisms and structure) (Jerry March, 5th edition (2001) on pages 368-375). Alternative radical scavengers suitable for use herein are the compounds according to the general Formula (II): wherein Rh R2, R3, R, and R5 are each independently selected from H, COO "M +, Cl, Br, SO3'M +, NO2, OCH3, OH or a primary or secondary C1 to C10 alkyl and M is H or alkali metal, preferably the radical scavengers described above they have a pKa of more than 8.5 to ensure the protonation of the hydroxyl group. Other radical scavengers suitable for use herein include those selected from the group (III) benzylamine, imidazole, di-tert-butylhydroxytoluene, hydroquinone, guanine, pyrazine, piperidine, morpholine, methylmorpholine, 2-methyloxyethylamine, and mixtures thereof. these. Preferred radical scavengers in accordance with the present invention are selected from the types of alkanolamines, amino sugars, amino acids, amino acid esters and mixtures of these. Particularly preferred compounds are: monoethanolamine, 3-amino-1-propanol, 4-amino-1-butanol, 5-amino-1-pentanol, 1-amino-2-propanol, 1-amino-2-butanol, 1- amine-2-pentanol, 1-amino-3-pentanol, 1-amino-4-pentanol, 3-amino-2-methylpropan-1-ol, 1-amino-2-methylpropan-2-ol, 3-aminopropane- 1,2-diol, glucosamine, N-acetylglucosamine, glycine, arginine, lysine, proline, glutamine, histidine, sarcosine, serine, glutamic acid, tryptophan, and mixtures thereof, and salts such as potassium, sodium and ammonium of these and mixtures of these. Especially preferred compounds are glycine, lysine, serine, 2-methoxyethylamine, glucosamine, glutamic acid, morpholine, piperidine, ethylamine, 3-amino-1-propanol and mixtures thereof. Radical scavengers according to the present invention preferably have a molecular weight of less than about 500, preferably less than about 300, more preferably less than about 250, to facilitate the penetration of the radical scavenger into the hair fiber . The compositions of the present invention preferably comprise from about 0.1% to about 10% by weight, preferably from about 1% to about 7% by weight of the radical scavenger. The radical scavenger is preferably selected so that it is not a species identical to the alkalizing agent. In accordance with one embodiment of the present invention the radical scavenger can be formed in place in the hair dyeing compositions before applying to the hair fibers. In another embodiment of the present invention there is provided a process for coloring the hair with the system of the invention, wherein the lotion and the developer are mixed to create a thickened coloring or decolorizing composition, and said thickened coloring or decolorizing composition is applied to the hair, let it act and then rinse. The dye composition for thickened hair, as used herein, has a viscosity of 7 to 25 Pa.s (7,000 to 25,000 cps), preferably 8 to 15 Pa.s (8,000 cps to 15,000 cps), with the maximum preference of 10 to 12 Pa.s (10,000 cps at 12,000 cps). The compositions of the present invention may comprise or be used in combination with a composition comprising a conditioning agent.

Conditioning agents suitable for use herein are selected from silicone materials, amino silicones, fatty alcohols, polymeric resins, carboxylic acid and polyol esters, cationic polymers, cationic surfactants, insoluble oils and materials derived from oils and mixtures thereof. Other materials include mineral oils and other oils such as glycerin and sorbitol. The conditioning agent will generally be used at levels of from about 0.05% to about 20% by weight of the composition, preferably from about 0.1% to about 15%, more preferably from about 0.2% to about 10%, even more preferably from about 0.2% to about 2%. In accordance with the present invention the compositions may comprise chelants. Chelators are well known in the industry and refer to a molecule or a mixture of different molecules, each capable of forming a chelate 7 with a metal ion. Chelators are well known in the industry and an incomplete list of them can be found in AE Martell and RM Smith, Critical Stability Constants, Vol. 1, Plenum Press, New York and London (1974) and AE Martell and RD Hancock, Metal Complexes in Aqueous Solution, Plenum Press, New York and London (1996) both documents are considered incorporated in this description as a reference. Examples of chelants suitable for use herein include EDDS (ethylenediamineadisuccinic acid), carboxylic acids (in particular aminocarboxylic acids), phosphonic acids (in particular aminophosphonic acids) and polyphosphoric acids (in particular linear polyphosphoric acids), their salts and derivatives. Chelants can be incorporated in the composition of the present invention as stabilizers and preservatives. In addition, it has been discovered that the chelators provide benefits for damage to hair fiber and therefore, can be used to further improve the hair damage profile of the present invention. The levels of chelants in the present invention can be as low as about 0.1%, preferably at least about 0.25%, more preferably about 0.5% for the most effective chelators such as the diamine-N.N'-dipolyzacid chelators and monoamide-N, N'-dipoly acid monoamine (for example EDDS). Less effective chelators are more preferably used in a concentration of at least about 1% and even more preferably greater than about 2% by weight of the composition, depending on the effectiveness of the chelator. Levels as high as approximately 10% may be used, but above this level significant problems may arise in the formulation.

EXAMPLES The following examples illustrate the present invention. The lotions illustrated below are prepared by mixing the components separately. When these four lotions are mixed separately with a commercially available developer (30 volume Nice 'N Easy (registered trademark) with 4 5%. of hydrogen peroxide), four hair coloring compositions are prepared with gel which, when applied to human hair, are dyed and incorporated by massaging them with the fingers.

A clinical trial evaluates the sensory effects of hair coloring products by placing them on the human arm. The panelists then classify the products using an established scale. A high score means a high sensory irritation. The composition 1 differs from what is stated in the invention. It has a lamellar phase index of only 25% and obtains a much higher score in the clinical evaluation. The composition 2 also does not coincide with that stated in the invention. It has a lamellar phase index of 100 and a low score on the test but is unstable. The compositions 3 and 4 coincide with that set forth in the present invention since they have acceptable scores in the test and are stable. Further illustrative formulations of the present invention are provided below:

Claims (10)

1. A two-part system for coloring or bleaching hair comprising (i) a thin lotion that optionally comprises an oxidative dye precursor that includes a solvent system and a surfactant system that releases a thickener when diluted with a developer, and (ii) a developer comprising an irritant amount to the scalp of an oxidizing agent, characterized in that the lotion has a lamellar phase index greater than 80% and less than 100%.

2. A system according to claim 1, further characterized in that the lotion has a lamellar phase index of 80% to 95%.

3. A system according to the preceding claims, further characterized in that the developer comprises hydrogen peroxide as an oxidant.

4. A system according to claim 3, further characterized in that the developer comprises more than 3.0% hydrogen peroxide, preferably more than 3.5% peroxide, more preferably more than 4.5% peroxide.

5. A system according to any of the preceding claims, further characterized in that the solvent system in the lotion is predominantly hydrophilic.

6. A system according to claim 5, further characterized in that the solvent system has a ClogP weighted average of less than 0.

7. A system according to any of the preceding claims, further characterized in that the lotion comprises 5% a 30% solvent, more preferably 15 to 27% solvent.

8. A system according to any of the preceding claims, further characterized in that the lotion comprises less than 3.5% by weight of MEA, preferably less than 3% by weight, more preferably less than 1% by weight, or 6% by 20% by weight. % by weight, more preferably from 9% to 15% by weight of MEA. A system according to the preceding claims, further characterized in that the lotion and the developer have a viscosity of between 0.001 and 5 Pa.s (1 and 5000 cps), and the hair coloring composition which is the result of the The mixture of the lotion and the developer has a viscosity of 7 to 25 Pa.s (7,000 and 25,000 cps). A process for coloring or bleaching the hair according to any of the preceding claims, further characterized in that the lotion and developer are mixed to create a thickened coloring or decolorizing composition to be applied to the hair, allowed to act and then rinsed.