GB580173A - Improvements in or relating to photographic processes - Google Patents
Improvements in or relating to photographic processesInfo
- Publication number
- GB580173A GB580173A GB422243A GB422243A GB580173A GB 580173 A GB580173 A GB 580173A GB 422243 A GB422243 A GB 422243A GB 422243 A GB422243 A GB 422243A GB 580173 A GB580173 A GB 580173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emulsion
- chloride
- bromide
- silver
- contrast
- 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
Links
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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
-
- 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03564—Mixed grains or mixture of emulsions
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
580,173. Photographic processes. KODAK, Ltd., and STEVENS, G. W. W. March 15, 1943, No. 4222. [Class 98 (ii)] In the production of prints of various degrees of gradation on material comprising a mixture of a low-contrast silver chloride emulsion and a high-contrast silver bromide or bromiodide emulsion, the silver chloride may be removed after exposure so that only the bromide emulsion can be developed to give high contrast. Low contrast could be obtained by selective development of the chloride emulsion and medium contrast by simultaneous development of both emulsions. The chloride emulsion contains at least 90 per cent, preferably 95 or 98 per cent silver chloride, and the bromide emulsion at least 40 per cent, preferably 60 or 80 per cent, silver bromide, the remainder of the halide being iodide or chloride, or both. The silver chloride may be dissolved out with an aqueous solution of sodium sulphite or ammonia, the emulsions being mixed or the chloride emulsion coated over the bromide emulsion. If the solution is previously saturated with silver bromide, the emulsions may be coated in any order. Specification 516,514 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB422243A GB580173A (en) | 1943-03-15 | 1943-03-15 | Improvements in or relating to photographic processes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB422243A GB580173A (en) | 1943-03-15 | 1943-03-15 | Improvements in or relating to photographic processes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB580173A true GB580173A (en) | 1946-08-29 |
Family
ID=9773038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB422243A Expired GB580173A (en) | 1943-03-15 | 1943-03-15 | Improvements in or relating to photographic processes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB580173A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712995A (en) * | 1949-07-04 | 1955-07-12 | Agfa Ag | Process for the direct production of positive photographic images |
| US2756148A (en) * | 1954-06-29 | 1956-07-24 | Eastman Kodak Co | Photographic emulsion having clayden effect susceptibility |
| DE1055951B (en) * | 1955-08-25 | 1959-04-23 | Gevaert Photo Prod Nv | Photographic reproduction process |
-
1943
- 1943-03-15 GB GB422243A patent/GB580173A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712995A (en) * | 1949-07-04 | 1955-07-12 | Agfa Ag | Process for the direct production of positive photographic images |
| US2756148A (en) * | 1954-06-29 | 1956-07-24 | Eastman Kodak Co | Photographic emulsion having clayden effect susceptibility |
| DE1055951B (en) * | 1955-08-25 | 1959-04-23 | Gevaert Photo Prod Nv | Photographic reproduction process |
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