US3649270A - Negative image silver transfer development - Google Patents
Negative image silver transfer development Download PDFInfo
- Publication number
- US3649270A US3649270A US826679A US3649270DA US3649270A US 3649270 A US3649270 A US 3649270A US 826679 A US826679 A US 826679A US 3649270D A US3649270D A US 3649270DA US 3649270 A US3649270 A US 3649270A
- Authority
- US
- United States
- Prior art keywords
- silver
- negative image
- silver halide
- receptor
- transfer development
- 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.)
- Expired - Lifetime
Links
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 32
- 239000004332 silver Substances 0.000 title claims abstract description 32
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 18
- -1 silver halide Chemical class 0.000 claims abstract description 15
- 108010010803 Gelatin Proteins 0.000 claims description 8
- 229920000159 gelatin Polymers 0.000 claims description 8
- 239000008273 gelatin Substances 0.000 claims description 8
- 235000019322 gelatine Nutrition 0.000 claims description 8
- 235000011852 gelatine desserts Nutrition 0.000 claims description 8
- NDGRWYRVNANFNB-UHFFFAOYSA-N pyrazolidin-3-one Chemical compound O=C1CCNN1 NDGRWYRVNANFNB-UHFFFAOYSA-N 0.000 claims description 7
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical group [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- ZZEYCGJAYIHIAZ-UHFFFAOYSA-N 4-methyl-1-phenylpyrazolidin-3-one Chemical group N1C(=O)C(C)CN1C1=CC=CC=C1 ZZEYCGJAYIHIAZ-UHFFFAOYSA-N 0.000 claims 1
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 239000000839 emulsion Substances 0.000 abstract description 6
- XPAZGLFMMUODDK-UHFFFAOYSA-N 6-nitro-1h-benzimidazole Chemical compound [O-][N+](=O)C1=CC=C2N=CNC2=C1 XPAZGLFMMUODDK-UHFFFAOYSA-N 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 3
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229940006280 thiosulfate ion Drugs 0.000 description 2
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 2
- GGZHVNZHFYCSEV-UHFFFAOYSA-N 1-Phenyl-5-mercaptotetrazole Chemical compound SC1=NN=NN1C1=CC=CC=C1 GGZHVNZHFYCSEV-UHFFFAOYSA-N 0.000 description 1
- 229920002307 Dextran Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- CMCWWLVWPDLCRM-UHFFFAOYSA-N phenidone Chemical compound N1C(=O)CCN1C1=CC=CC=C1 CMCWWLVWPDLCRM-UHFFFAOYSA-N 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
- G03C8/02—Photosensitive materials characterised by the image-forming section
- G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
Definitions
- This invention relates to photography and more particularly to preparation of images by the silver diffusion transfer process. Still more particularly it relates to the preparation of negative images by the silver diffusion transfer process.
- the silver difiusion transfer process is well known in the photographic art. It forms the basis for the present day directpositive, print-forming cameras. However, the silver diffusion transfer process has hitherto been capable only of making positive copies of an original on a receptor layer. There was no way to prepare a negative image of an original by that process. The present invention teaches how to prepare a negative image by the silver diffusion transfer process.
- This invention uses a photosensitive layer comprising fogged silver halide crystals in a colloid binder.
- the fogged silver halide crystals are treated with S-nitrobenzimidazole at high pH to modify their solubility in the silver halide solvents used in silver diffusion transfer development.
- After the layer is exposed imagewise to actinic radiation, it is treated with an aqueous silver diffusion transfer developer and placed in contact with a receptor layer having nuclei for the deposition of metallic silver. A negative image of the original is obtained on the receptor layer and in the original photosensitive layer.
- gelatino-silver halide elements employed in this invention are those prepared by techniques known in the art. Silver chloride or chlorobromide emulsions may be used.
- Useful receptor layers are those nonporous supports having nuclei deposited uniformly over the surface of the receptor for the deposition of metallic silver from the transfer developer solution. Useful receptor layers are described in US. Pat. No. 2,352,014.
- Developers useful in practicing this invention are high pH 1- phenyl-3-pyrazolidone/hydroquinone developers containing 5-nitrobenzimidazole, 1-phenyl-5-mercaptotetrazole, and a silver halide solvent such as sodium thiosulfate.
- the support for the emulsion layers used in this novel process may be any suitable web.
- cellulose mixed esters, etc. may be used.
- Polymerized vinyl compounds e.g., copolymerized vinyl acetate and vinyl chloride, polystyrene and polymerized acrylatcs may also be mentioned.
- the film formed from the polyesterification product of a dicarboxylic acid and a dihydric alcohol made according to the teachings of Alles, US. Pat. No. 2,779,684 and the patents referred to in the specification of that patent are suitable. Waterproof photographic paper base is also a suitable support.
- a silver chlorobromide emulsion of low gelatin content coated on a support is fogged by exposure to white light, bathed in a solution of 5-nitrobenzimindazole, and dried in darkness. After the element is exposed imagewise, it is soaked in an aqueous silver transfer developer comprised of a high pH 3- pyrazolidone/hydroquinone developer, e.g., a 3- pyrazolidone/hydroguinone developer with added S-nitrobenzimidazole, l-phenyl-S-mercaptotetrazole, and thiosulfate ion.
- an aqueous silver transfer developer comprised of a high pH 3- pyrazolidone/hydroquinone developer, e.g., a 3- pyrazolidone/hydroguinone developer with added S-nitrobenzimidazole, l-phenyl-S-mercaptotetrazole, and thiosulfate ion.
- the element is then placed in contact with a silver ion transfer receptor layer such as that described in Rott U.S. Pat. Nos. 2,352,014 and Gray 2,878,121, Mar. 17, 1959, for seconds to several minutes. After the element and receptor are separated, a negative image is obtained on the receptor layer.
- a silver ion transfer receptor layer such as that described in Rott U.S. Pat. Nos. 2,352,014 and Gray 2,878,121, Mar. 17, 1959, for seconds to several minutes. After the element and receptor are separated, a negative image is obtained on the receptor layer.
- Suitable 3-pyrazolidones are listed in Kendall US. Pat. No. 2,289,367, July 14, 1942.
- a photographic element was prepared by coating an aqueous gelatin dispersion of silver chlorobromide (20 mole percent silver chloride and 30 mole percent silver bromide) on a film base prepared as described in Example IV of Alles, US.
- the dispersion had a ratio of silver halide to gelatin of 19:1 by weight and was coated at a pH of 6 at a rate of I16 milligrams of silver halide per square decimeter. After drying, the element was bathed for 30 seconds in the following solution with white lights on:
- the sample was rinsed 5 seconds, the white lights were extinguished, and the sample was dried.
- One-half of the sample was exposed to a No. 2A Photoflood Lamp for seconds at a distance of 1 foot.
- the exposed sample was soaked for 2 seconds in a developer of the following composition:
- the emulsion side of the element was then placed in contact with the face side of a piece of Polaroid receptor paper. After 30 seconds, the sample and receptor were separated and both were washed in water for 1 minute and dried. The portion of the sample which received the second exposure was blackened and that portion of the receptor which had contacted the exposed portion of the sample was also blackened.
- gelatin is the preferred macromolecular waterpermeable organic colloid binder for the silver halide grains
- mixtures of gelatin and dextran or dextrin can be used.
- the process is useful for forming images of various types, and is particularly useful in forming negative radiographic images.
- Suitable compounds for thiosulfate ions are sodium, potassium, and ammonium thiosulfate.
- Useful high pH transfer 3- pyrazolidone developers containing said compounds and other ingredients are described in Blake Ser. No. 401,971, filed Oct. 6, 1964, now US. Pat. No. 3,490,905.
- 5- Nitrobenzimidazole and l-Phenyl-S-mercaptotetrazole are added to the developer.
- a process for forming a negative image in a receptor surface from an irnagewise exposed, prefogged, photographic gelatin-containing silver halide layer which comprises a. impregnating the layer with an aqueous solution of 5- nitrobenzimidazole,
- aqueous silver transfer developer of high pH containing a 3-pyrazolidone, hydroquinone, S-nitrobenzimidazole, l-phenyl-S-mercaptotetrazole, and thiosulfate ion,
- gelatin is the sole binder for the silver halide.
- a process according to claim 1, wherein the silver halide is silver chlorobromide.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
A gelatino-silver halide emulsion layer containing fogged silver halide crystals which have been treated with 5-nitrobenzimidazole is exposed to actinic radiation and processed by silver diffusion transfer development to give a negative image of an original on a receptor layer. Useful negative radiographic images can be obtained by the process.
Description
United States Patent Blake [4 1 Mar. 14, 1972 [73] Assignee: E. I. du Pont de Nemours and Company,
Wilmington, Del.
May 21, 1969 [22] Filed:
[21] Appl. No.: 826,679
[58] Field of Search ..96/66, 29
[56] References Cited UNITED STATES PATENTS 2/1950 Stauffer ..96/64 3,464,822 9/1969 Blake Primary Examiner-David Klein Assistant Examiner-John L. Goodrow Attorney-James T. Corle [57] ABSTRACT A gelatino-silver halide emulsion layer containing fogged silver halide crystals which have been treated with 5 m nitrobenzimidamle is exposed to actinic radiation and processed by silver diffusion transfer development to give a negative image of an original on a receptor layer. Useful negative radiographic images can be obtained by the process.
4 Claims, No Drawings NEGATIVE IMAGE SILVER TRANSFER DEVELOPMENT BACKGROUND OF THE INVENTION This invention relates to photography and more particularly to preparation of images by the silver diffusion transfer process. Still more particularly it relates to the preparation of negative images by the silver diffusion transfer process.
The silver difiusion transfer process is well known in the photographic art. It forms the basis for the present day directpositive, print-forming cameras. However, the silver diffusion transfer process has hitherto been capable only of making positive copies of an original on a receptor layer. There was no way to prepare a negative image of an original by that process. The present invention teaches how to prepare a negative image by the silver diffusion transfer process.
SUMMARY OF THE INVENTION This invention uses a photosensitive layer comprising fogged silver halide crystals in a colloid binder. The fogged silver halide crystals are treated with S-nitrobenzimidazole at high pH to modify their solubility in the silver halide solvents used in silver diffusion transfer development. After the layer is exposed imagewise to actinic radiation, it is treated with an aqueous silver diffusion transfer developer and placed in contact with a receptor layer having nuclei for the deposition of metallic silver. A negative image of the original is obtained on the receptor layer and in the original photosensitive layer.
The gelatino-silver halide elements employed in this invention are those prepared by techniques known in the art. Silver chloride or chlorobromide emulsions may be used.
Useful receptor layers are those nonporous supports having nuclei deposited uniformly over the surface of the receptor for the deposition of metallic silver from the transfer developer solution. Useful receptor layers are described in US. Pat. No. 2,352,014.
Developers useful in practicing this invention are high pH 1- phenyl-3-pyrazolidone/hydroquinone developers containing 5-nitrobenzimidazole, 1-phenyl-5-mercaptotetrazole, and a silver halide solvent such as sodium thiosulfate.
The support for the emulsion layers used in this novel process may be any suitable web. For example, cellulose mixed esters, etc., may be used. Polymerized vinyl compounds, e.g., copolymerized vinyl acetate and vinyl chloride, polystyrene and polymerized acrylatcs may also be mentioned. The film formed from the polyesterification product of a dicarboxylic acid and a dihydric alcohol made according to the teachings of Alles, US. Pat. No. 2,779,684 and the patents referred to in the specification of that patent are suitable. Waterproof photographic paper base is also a suitable support.
ln a preferred embodiment of this invention a silver chlorobromide emulsion of low gelatin content coated on a support is fogged by exposure to white light, bathed in a solution of 5-nitrobenzimindazole, and dried in darkness. After the element is exposed imagewise, it is soaked in an aqueous silver transfer developer comprised of a high pH 3- pyrazolidone/hydroquinone developer, e.g., a 3- pyrazolidone/hydroguinone developer with added S-nitrobenzimidazole, l-phenyl-S-mercaptotetrazole, and thiosulfate ion. The element is then placed in contact with a silver ion transfer receptor layer such as that described in Rott U.S. Pat. Nos. 2,352,014 and Gray 2,878,121, Mar. 17, 1959, for seconds to several minutes. After the element and receptor are separated, a negative image is obtained on the receptor layer. Suitable 3-pyrazolidones are listed in Kendall US. Pat. No. 2,289,367, July 14, 1942.
The following example is intended to illustrate the invention without limiting its scope.
EXAMPLEl A photographic element was prepared by coating an aqueous gelatin dispersion of silver chlorobromide (20 mole percent silver chloride and 30 mole percent silver bromide) on a film base prepared as described in Example IV of Alles, US.
Pat. No. 2,779,684. The dispersion had a ratio of silver halide to gelatin of 19:1 by weight and was coated at a pH of 6 at a rate of I16 milligrams of silver halide per square decimeter. After drying, the element was bathed for 30 seconds in the following solution with white lights on:
[0 S-nitrobenzimidazole nitrate 25 ml.
solution (1 gram per 100 ml. ethanol) l.0 Molar Sodium hydroxide 25 ml.
The sample was rinsed 5 seconds, the white lights were extinguished, and the sample was dried. One-half of the sample was exposed to a No. 2A Photoflood Lamp for seconds at a distance of 1 foot. The exposed sample was soaked for 2 seconds in a developer of the following composition:
800 ml. 80 g. l6 g.
l g. 5.5 g. 2 g.
l0 ml.
g. I000 ml.
The emulsion side of the element was then placed in contact with the face side of a piece of Polaroid receptor paper. After 30 seconds, the sample and receptor were separated and both were washed in water for 1 minute and dried. The portion of the sample which received the second exposure was blackened and that portion of the receptor which had contacted the exposed portion of the sample was also blackened.
While gelatin is the preferred macromolecular waterpermeable organic colloid binder for the silver halide grains, mixtures of gelatin and dextran or dextrin can be used.
The process is useful for forming images of various types, and is particularly useful in forming negative radiographic images.
Suitable compounds for thiosulfate ions are sodium, potassium, and ammonium thiosulfate. Useful high pH transfer 3- pyrazolidone developers containing said compounds and other ingredients are described in Blake Ser. No. 401,971, filed Oct. 6, 1964, now US. Pat. No. 3,490,905. 5- Nitrobenzimidazole and l-Phenyl-S-mercaptotetrazole are added to the developer.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A process for forming a negative image in a receptor surface from an irnagewise exposed, prefogged, photographic gelatin-containing silver halide layer which comprises a. impregnating the layer with an aqueous solution of 5- nitrobenzimidazole,
b. impregnating the layer with an aqueous silver transfer developer of high pH containing a 3-pyrazolidone, hydroquinone, S-nitrobenzimidazole, l-phenyl-S-mercaptotetrazole, and thiosulfate ion,
0. placing the layer while wet in contact with the surface of a silver ion transfer receptor surface, and
d. separating the layers whereby a negative image is obtained on the receptor surface.
2. A process according to claim 1, wherein said gelatin is the sole binder for the silver halide.
3. A process according to claim 1, wherein the silver halide is silver chlorobromide.
4. A process according to claim 1, wherein said 3- pyrazolidone is l-phenyl-4-methyl-3-pyrazolidone.
i a l t i
Claims (3)
- 2. A process according to claim 1, wherein said gelatin is the sole binder for the silver halide.
- 3. A process according to claim 1, wherein the silver halide is silver chlorobromide.
- 4. A process according to claim 1, wherein said 3-pyrazolidone is 1-phenyl-4-methyl-3-pyrazolidone.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82667969A | 1969-05-21 | 1969-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3649270A true US3649270A (en) | 1972-03-14 |
Family
ID=25247236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US826679A Expired - Lifetime US3649270A (en) | 1969-05-21 | 1969-05-21 | Negative image silver transfer development |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3649270A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2209123A1 (en) * | 1972-12-04 | 1974-06-28 | Minnesota Mining & Mfg | |
| US4309499A (en) * | 1978-11-14 | 1982-01-05 | Fuji Photo Film Co., Ltd. | Formation of black-and-white silver-containing negative images by a diffusion transfer process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497917A (en) * | 1947-10-17 | 1950-02-21 | Eastman Kodak Co | Method of producing direct positive photographs having increased density |
| US3464822A (en) * | 1965-09-13 | 1969-09-02 | Du Pont | Process for making electrically conductive images |
-
1969
- 1969-05-21 US US826679A patent/US3649270A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497917A (en) * | 1947-10-17 | 1950-02-21 | Eastman Kodak Co | Method of producing direct positive photographs having increased density |
| US3464822A (en) * | 1965-09-13 | 1969-09-02 | Du Pont | Process for making electrically conductive images |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2209123A1 (en) * | 1972-12-04 | 1974-06-28 | Minnesota Mining & Mfg | |
| US4309499A (en) * | 1978-11-14 | 1982-01-05 | Fuji Photo Film Co., Ltd. | Formation of black-and-white silver-containing negative images by a diffusion transfer process |
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