GB2303931A - Forming a photographic colour image - Google Patents
Forming a photographic colour image Download PDFInfo
- Publication number
- GB2303931A GB2303931A GB9515515A GB9515515A GB2303931A GB 2303931 A GB2303931 A GB 2303931A GB 9515515 A GB9515515 A GB 9515515A GB 9515515 A GB9515515 A GB 9515515A GB 2303931 A GB2303931 A GB 2303931A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bleach
- image
- processing
- silver
- hydrogen peroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007844 bleaching agent Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 37
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052709 silver Inorganic materials 0.000 claims abstract description 25
- 239000004332 silver Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 23
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- -1 silver halide Chemical class 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 229910001508 alkali metal halide Inorganic materials 0.000 claims abstract description 7
- 150000008045 alkali metal halides Chemical class 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 5
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 4
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 21
- 239000000839 emulsion Substances 0.000 description 10
- 239000000975 dye Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- PODWXQQNRWNDGD-UHFFFAOYSA-L sodium thiosulfate pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].[O-]S([S-])(=O)=O PODWXQQNRWNDGD-UHFFFAOYSA-L 0.000 description 2
- UOMQUZPKALKDCA-UHFFFAOYSA-K 2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxymethyl)amino]acetate;iron(3+) Chemical compound [Fe+3].OC(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UOMQUZPKALKDCA-UHFFFAOYSA-K 0.000 description 1
- ORWQBKPSGDRPPA-UHFFFAOYSA-N 3-[2-[ethyl(methyl)amino]ethyl]-1h-indol-4-ol Chemical compound C1=CC(O)=C2C(CCN(C)CC)=CNC2=C1 ORWQBKPSGDRPPA-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- JAWGVVJVYSANRY-UHFFFAOYSA-N cobalt(3+) Chemical class [Co+3] JAWGVVJVYSANRY-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- NXPHCVPFHOVZBC-UHFFFAOYSA-N hydroxylamine;sulfuric acid Chemical compound ON.OS(O)(=O)=O NXPHCVPFHOVZBC-UHFFFAOYSA-N 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- AJDUTMFFZHIJEM-UHFFFAOYSA-N n-(9,10-dioxoanthracen-1-yl)-4-[4-[[4-[4-[(9,10-dioxoanthracen-1-yl)carbamoyl]phenyl]phenyl]diazenyl]phenyl]benzamide Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2NC(=O)C(C=C1)=CC=C1C(C=C1)=CC=C1N=NC(C=C1)=CC=C1C(C=C1)=CC=C1C(=O)NC1=CC=CC2=C1C(=O)C1=CC=CC=C1C2=O AJDUTMFFZHIJEM-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical class OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 1
- MGMBEMDBZKTGRG-UHFFFAOYSA-M sodium;hydrogen carbonate;hydrogen peroxide Chemical compound [Na+].OO.OC([O-])=O MGMBEMDBZKTGRG-UHFFFAOYSA-M 0.000 description 1
- VAVPGQSSOJBZIP-UHFFFAOYSA-N sodium;iron(3+) Chemical compound [Na+].[Fe+3] VAVPGQSSOJBZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001043 yellow dye Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/3017—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials with intensification of the image by oxido-reduction
- G03C7/302—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials with intensification of the image by oxido-reduction using peroxides
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/3017—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials with intensification of the image by oxido-reduction
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
- G03C7/421—Additives other than bleaching or fixing agents
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
A method of forming a photographic image in an imagewise exposed photographic silver halide material includes a redox amplification dye image-forming step in a combined developer/amplifier solution (devamp) and a bleach step wherein: (a) the bleach solution comprises hydrogen peroxide or a compound which releases hydrogen peroxide during processing, (b) the bleach solution contains an alkali metal halide, (c) the bleach step follows the image-forming step without any intermediate processing bath, and (d) image formation by redox amplification continues in the bleach solution. The method may be used in low-volume, thin-tank processors.
Description
METHOD OF FORMING A PHOTOGRAPHIC COLOUR IMAGE
Field of the Invention
The invention relates to a method of forming a colour photographic image by a redox amplification method. In particular, this invention relates to processing low silver photographic materials in a redox amplifying developer followed by a bleach.
Background of the Invention
Redox amplification processes have been described, for example in British Specification Nos.
1,268,126, 1,399,981, 1,403,418 and 1,560,572. In such processes colour materials are developed to produce a silver image (which may contain only small amounts of silver) and then treated with a redox amplifying solution (or a combined developeramplifier) to form a dye image.
The developer-amplifier solution contains a colour developing agent and an oxidising agent which will oxidise the colour developing agent in the presence of the silver image which acts as a catalyst.
Oxidised colour developer reacts with a colour coupler to form the image dye. The amount of dye formed depends on the time of treatment or the availability of colour coupler and is less dependent on the amount of silver in the image as is the case in conventional colour development processes.
Examples of suitable oxidising agents include peroxy compounds including hydrogen peroxide and compounds which provide hydrogen peroxide, eg addition compounds of hydrogen peroxide; cobalt (III) complexes including cobalt hexammine complexes; and periodates.
Mixtures of such compounds can also be used.
The image-forming step can be followed by a stop bath, bleach and fix, although the bleach and/or fix may be omitted if the silver coating weight of the material processed is low enough. Recently it has been proposed that the bleach bath may contain a peroxide as sole bleaching agent. Such proposals have carried the warning that rede amplification has to be stopped before bleaching otherwise colour staining will occur due to image formation continuing in the peroxide bleach solution.
Problem to be Solved by the Invention
There is a continuing need to reduce photographic processing times. This is desirable as it means that processing throughput can be increased.
Summary of the Invention
According to the present invention there is provided a method of forming a photographic image in an imagewise exposed photographic silver halide material which includes a redox amplification dye image-forming step in a combined developer/amplifier solution (devamp) and a bleach step wherein:
(a) the bleach solution comprises hydrogen
peroxide or a compound which releases hydrogen
peroxide during processing,
(b) the bleach solution contains an alkali metal
halide,
(c) the bleach step follows the image-forming
step without any intermediate processing bath,
and
(d) image formation by redox amplification
continues in the bleach solution.
Advantageous Effect of the Invention
The processing time can be reduced while at the same time better colours are obtained.
The effluent from the process contains no iron as it would if a conventional ferric EDTA bleaching agent were used.
The overall chemical oxygen demand of the process is reduced.
Without the alkali metal halide in the bleach solution the emulsion layers of the treated material are destroyed by the formation of oxygen bubbles. In addition stain is formed without the halide.
Detailed Description of the Invention
Preferably the time of treatment in the bleach step is less than the time of treatment in the devamp step. In one embodiment the time of treatment in the bleach step is less than half the time of treatment in the devamp step and particularly less than one third the time of treatment in the devamp step.
Preferably the oxidant of the redox amplification step is hydrogen peroxide or a compound which releases hydrogen peroxide during processing.
The present bleach solutions preferably contain an alkali metal halide at a concentration of 0.25 to 50g, preferably 0.5 to 35g, more preferably 1 to 30g (as sodium chloride) . In the absence of halide the bleach solution forms oxygen bubbles in the material being processed and removes the emulsion layers of the material from the support.
The present bleach baths preferably contain 30% hydrogen peroxide solution at concentrations of from 10 to 300 ml/l, preferably from 20 to 100 ml/l.
Preferably peroxide is the sole oxidant of the bleach.
The present bleach baths preferably have a pH of from 8 to 11.5, preferably from 9 to 11.
A particular application of this technology is in the processing of silver chloride colour paper, for example paper comprising at least 85 mole percent silver chloride, especially such paper with low silver levels, for example total silver levels below 130 mg/m2, eg from 25 to 120 mg/m2, preferably below 60 mg/m2 and particularly in the range 20 to 60 mg/m2.
Within these total ranges the blue sensitive emulsion layer unit may comprise 20 to 60 mg/m2, preferably 25 to 50 mg/m2 with the remaining silver divided between the red and green-sensitive layer units, preferably more or less equally between the red and greensensitive layer units.
The photographic materials can be black-andwhite, single colour elements or multicolour elements.
Multicolour elements contain dye image-forming units sensitive to each of the three primary regions of the spectrum. Each unit can be comprised of a single emulsion layer or of multiple emulsion layers sensitive to a given region of the spectrum. The layers of the element, including the layers of the image-forming units, can be arranged in various orders as known in the art. In a alternative format, the emulsions sensitive to each of the three primary regions of the spectrum can be disposed as a single segmented layer.
A typical multicolour photographic element comprises a support bearing a cyan dye image-forming unit comprised of at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one greensensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, and a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler. The element can contain additional layers, such as filter layers, interlayers, overcoat layers, subbing layers, and the like.
Suitable materials for use in the emulsions and elements processed by the method of this invention, are described in Research Disclosure Item 36544,
September 1994, published by Kenneth Mason
Publications, Emsworth, Hants, United Kingdom.
The present processing method is preferably carried out by passing the material to be processed through a tank containing the processing solution which is recirculated through the tank at a rate of from 0.1 to 10 tank volumes per minute.
The preferred recirculation rate is from 0.5 to 8, especially from 1 to 5 and particular from 2 to 4 tank volumes per minute.
The recirculation, with or without replenishment, is carried out continuously- or intermittently. In one method of working both could be carried out continuously while processing was in progress but not at all or intermittently when the machine was idle.
Replenishment may be carried out by introducing the required amount of replenisher into the recirculation stream either inside or outside the processing tank.
It is advantageous to use a tank of relatively small volume. Hence in a preferred embodiment of the present invention the ratio of tank volume to maximum area of material accomodatable therein (ie maximum path length x width of material) is less than 11 dm3/m2, preferably less than 3 dm3/m2.
The shape and dimensions of the processing tank are preferably such that it holds the minimum amount of processing solution while still obtaining the required results. The tank is preferably one with fixed sides, the material being advanced therethrough by drive rollers. Preferably the photographic material passes through a thickness of solution less than 11 mm, preferably less than 5 mm and especially about 2 mm. The shape of the tank is not critical but it could be in the shape of a shallow tray or, preferably U-shaped. It is preferred that the dimensions of the tank be chosen so that the width of the tank is the same or only just wider than the width of the material to be processed.
The total volume of the processing solution within the processing channel and recirculation system is relatively smaller as compared to prior art processors. In particular, the total amount of processing solution in the entire processing system for a particular module is such that the total volume in the processing channel is at least 40 percent of the total volume of processing solution in the system.
Preferably, the volume of the processing channel is at least about 50 percent of the total volume of the processing solution in the system.
In order to provide efficient flow of the processing solution through the opening or nozzles into the processing channel, it is desirable that the nozzles/opening that deliver the processing solution to the processing channel have a configuration in accordance with the following relationship:
0.6 1 F/A S 23 wherein:
F is the flow rate of the solution through the nozzle in litres/minute; and
A is the cross-sectional area of the nozzle provided in square centimetres.
Providing a nozzle in accordance with the foregoing relationship assures appropriate discharge of the processing solution against the photosensitive material. Such Low Volume Thin Tank systems are described in more detail in the following patent specifications: US 5,294,956, US 5,179,404,
US 5,270,762, EP 559,025, EP 559,026, EP 559,027,
WO 92/10790, WO 92/17819, WO 93/04404, WO 92/17370,
WO 91/19226, WO 91/12567, WO 92/07302, WO 93/00612,
WO 92/07301, and WO 92/09932
The following Example is included for a better understanding of the invention.
EXAMPLE
The following processing solutions were made up.
RX developer/amplifier l-hydroxyethylidene-l, 1 '-diphosphonic acid 0.6g
diethyltriamine-pentaacetic
acid 2.0g Dipotassium hydrogen phosphate 40.0g Hydroxylamine sulphate 0.5g 4-N-ethyl-N-(ss-methanesulphonamido- ethyl)-Q-toluidine sesquisulphate 4.5g
Hydrogen Peroxide (30% w/w) 2ml
Water to 1 litre
pH adjusted to 11.7
Fix/stop
Sodium thiosulphate pentahydrate 20g
Sodium sulphite anhydrous 30g
Sodium acetate 40g
Water to 1 litre
pH adjusted to 5.0
with sulphuric acid at 250C Bleach-fix
Sodium iron(III) EDTA 75g
Sodium thiosulphate pentahydrate 75g
Acetic acid lolls Water to 1 litre
pH adjusted to 6.0 at 20 C
with 10% sodium carbonate solution
Bleach 1
30% hydrogen peroxide somas sodium chloride lg
sodium hydrogen carbonate 20g
Water to 1 litre
pH adjusted to 10.0 at 20 C
with 3M sodium hydroxide
Bleach 2
30% hydrogen peroxide
sodium hydrogen carbonate 20g
Water to 1 litre
pH adjusted to 10.0 at 20 C
with 3M sodium hydroxide
The solutions described above were use to process a low silver paper containing l9mg/m2 Ag in red and green sensitive layers and 30mg/m2 in the blue sensitive layer, exposed to 21 step colour wedges for 0.ls.The processes carried out were as follows:
Process 1 (Comparison)
Develop 45s 350C Fix/Stop 45s 35 C
Bleach-Fix 45s 35 C
Wash 45s 35 C
Dry
Process 2 (Comparison)
Develop 45s 35 C
Fix/Stop 45s 35 C
Wash 45s 35 C
Dry
Process 3 (Invention)
Develop 35s 35 C
Bleach 1 10s 350C Fix/Stop 45s 350C Wash 45s 35 C
Dry
Process 4 (Comparison)
Develop 35s 35 C
Bleach 2 10s 35 C
Fix/Stop 45s 35 C
Wash 45s 35 C
Dry
Process 5 (Comparison)
Develop 35s 35"C Fix/Stop 45s 35 C
Wash 45s 35 C
Dry
After processing the steps were read and sensitometric parameters calculated.
The following Table 1 summarises the sensitometry read on the neutral exposed wedge.
TABLE 1
Process Dmin Dmax Speed Inertia Speed Contrast Shoulder Toe No. Contrast R G B R G B R G B R G B R G B R G B R G B 1 .095 .101 .086 2.95 2.66 2.29 133 123 125 150 144 151 4.83 3.79 3.08 2.27 2.01 1.76 .196 .229 .228 1 .097 .104 .088 2.91 2.71 2.53 137 129 130 153 147 154 4.81 4.23 3.47 2.23 2.09 1.89 .196 .238 .235 3 .101 .104 .086 2.90 2.66 2.28 142 131 129 162 154 160 4.65 4.07 3.16 2.17 2.01 1.84 .197 .230 .230 4 .143 .125 .120 - - - - - .214 .253 ..241 5 .092 .092 .082 2.61 2.46 1.81 129 119 119 148 142 147 4.24 3.65 2.86 1.99 1.85 1.55 .192 .223 .221 The results show that the sensitometry of the invention, Process 3 is similar to the bleach-fixed process but took 45 seconds less time to process.
Process 2 shows increased density and contrast due to retained silver. The sensitometry of Process 4 was not complete as the paper was destroyed in high density area by the formation of oxygen bubbles in the film. At low densities without chloride in the bleach, stain was observed. The shorter development time(35s) without the bleach following the developer showed low density particularly in the blue sensitive layer, demonstrating that formation of the dye image was continuing in the bleach
The following Table 2 summarises the Dmin and
Dmax read on the blue exposed wedge. This shows the amount unwanted colour contamination due to retained silver.
TABLE 2
Process No. Dmin Dmax G G B R G B 1 .089 .098 .084 0.14 0.54 2.20 2 .094 .104 .091 0.28 0.68 2.31 3 .090 .102 .085 0.16 0.57 2.20 4 .143 . .120 .121 - - 5 .087 .098 .082 0.27 0.69 2.12 In the Dmax area of Processes 2 and 5 without bleach (comparative) high red and green densities are observed in the blue exposed patches due to retained silver which results in colour degradation of the yellow layer particularly at high densities. Most of this increased grey density is removed by process 3 (the invention), in which the result is similar to the long process time Process 1 (comparative). Processes 1 and 3 give 'brighter' yellows.
Claims (11)
1. A method of forming a photographic image in an imagewise exposed photographic silver halide material which includes a redox amplification dye image-forming step in a combined developer/amplifier solution (devamp) and a bleach step wherein:
(a) the bleach solution comprises hydrogen
peroxide or a compound which releases hydrogen
peroxide during processing,
(b) the bleach solution contains an alkali metal
halide,
(c) the bleach step follows the image-forming
step without any intermediate processing bath,
and
(d) image formation by redox amplification
continues in the bleach solution.
2. A method as claimed in claim 1 in which the time of treatment in the bleach step is less than the time of treatment in the devamp step.
3. A method as claimed in claim 1 in which the oxidant of the redox amplification step is hydrogen peroxide or a compound which releases hydrogen peroxide during processing.
4. A method as claimed in claim 1 or 2 in which the bleach solution contains an alkali metal halide at a concentration of 0.25 to 50g, preferably 0.5 to 35g (as sodium chloride).
5. A method as claimed in claim 3 in which the bleach solution contains an alkali metal halide at a concentration of 1 to 30g (as sodium chloride).
6. A method as claimed in any of claims 1-4 in which the bleach bath preferably has a pH of from 8 to 11.5, preferably from 9 to 11.
7. A method as claimed in any of claims 1-5 in which the photographic silver halide material is a silver chloride colour paper whose silver halide comprises at least 85 mole percent silver chloride.
8. A method as claimed in claim 6 in which the total silver halide coating weight of the photographic material is under 30 mg/m2 as silver.
9. A method as claimed in claim 7 in which the total silver halide coating weight is from 1 to 20 mg/m2 as silver.
10. A method as claimed in any of claims 1-8 in which the processing is carried out by passing the material to be processed through a tank containing the processing solution which is recirculated through the tank at a rate of from 0.1 to 10 tank volumes per minute.
11. A method as claimed in any of claims 1-9 in which the processing is carried out in a machine wherein the ratio of tank volume to maximum area of material accomodatable therein (ie maximum path length x width of material) is less than 11 dm3/m2, preferably less than 3 dm3/m2.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9515515A GB2303931B (en) | 1995-07-28 | 1995-07-28 | Method of forming a photographic colour image |
| JP19923396A JPH09106053A (en) | 1995-07-28 | 1996-07-29 | Formation method of photographic color image |
| US08/953,941 US5925504A (en) | 1995-07-28 | 1997-10-20 | Method of forming a photographic color image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9515515A GB2303931B (en) | 1995-07-28 | 1995-07-28 | Method of forming a photographic colour image |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9515515D0 GB9515515D0 (en) | 1995-09-27 |
| GB2303931A true GB2303931A (en) | 1997-03-05 |
| GB2303931B GB2303931B (en) | 1999-03-24 |
Family
ID=10778423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9515515A Expired - Fee Related GB2303931B (en) | 1995-07-28 | 1995-07-28 | Method of forming a photographic colour image |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH09106053A (en) |
| GB (1) | GB2303931B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5925504A (en) * | 1995-07-28 | 1999-07-20 | Eastman Kodak Company | Method of forming a photographic color image |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992001524A1 (en) * | 1990-07-23 | 1992-02-06 | Davy (Distington) Limited | Method of manufacturing metal strip |
-
1995
- 1995-07-28 GB GB9515515A patent/GB2303931B/en not_active Expired - Fee Related
-
1996
- 1996-07-29 JP JP19923396A patent/JPH09106053A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992001524A1 (en) * | 1990-07-23 | 1992-02-06 | Davy (Distington) Limited | Method of manufacturing metal strip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5925504A (en) * | 1995-07-28 | 1999-07-20 | Eastman Kodak Company | Method of forming a photographic color image |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9515515D0 (en) | 1995-09-27 |
| JPH09106053A (en) | 1997-04-22 |
| GB2303931B (en) | 1999-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040728 |