GB586782A - Improvements relating to photographic materials - Google Patents
Improvements relating to photographic materialsInfo
- Publication number
- GB586782A GB586782A GB21984/44A GB2198444A GB586782A GB 586782 A GB586782 A GB 586782A GB 21984/44 A GB21984/44 A GB 21984/44A GB 2198444 A GB2198444 A GB 2198444A GB 586782 A GB586782 A GB 586782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- exposure
- acid
- air
- layer
- 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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/32—Latensification; Densensitisation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
586,782. Intensifying photographic latent images. KODAK, Ltd. (Eastman Kodak Co., Weyerts, W. J., and Wiederhold, C. W.). Nov. 8, 1944, No. 21984. Addition to 570,703. [Class 98 (ii)] Intensification of a latent image in an exposed gelatino silver halide emulsion layer is produced by treatment of the layer subsequent to the exposure but prior to development with a solution containing sulphurous acid but free of developing agent, by removal uniformly of the unabsorbed solution without removal of the absorbed solution, and by storing the layer in air allowed to circulate freely over it for at least five minutes. A solution of sulphurous acid, sodium bisulphite, or potassium metabisulphite may be used, and should have a pH below 6. The colour sensitivity of the emulsion is not removed. The excess liquid may be removed by an air squeegee or wiping. The air may be allowed to circulate for 10 to 20 minutes. The sulphurous acid bath should not contain developing agents acting as antioxidants such as hydroquinone or iso-ascorbic acid. In examples, comparative figures are given for the speed, gamma and density of support plus fog, using a metol-hydroquinoneboric acid-borax developer with pre-treatments in distilled water, sodium bisulphite solution and potassium metabisulphite solution. Intensification of the latent image by exposure to ammonia vapour, by exposure to the radiation of a safelight, by subjection to the action of heat and humidity and by treatment with sulphur dioxide is referred to. Specification 510,808 is referred to.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB21984/44A GB586782A (en) | 1944-11-08 | 1944-11-08 | Improvements relating to photographic materials |
US607273A US2437412A (en) | 1944-11-08 | 1945-07-26 | Latent image intensification with sulfur dioxide |
FR950281D FR950281A (en) | 1944-11-08 | 1946-08-28 | Method of enhancing photographic images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB21984/44A GB586782A (en) | 1944-11-08 | 1944-11-08 | Improvements relating to photographic materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB586782A true GB586782A (en) | 1947-03-31 |
Family
ID=10172048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21984/44A Expired GB586782A (en) | 1944-11-08 | 1944-11-08 | Improvements relating to photographic materials |
Country Status (3)
Country | Link |
---|---|
US (1) | US2437412A (en) |
FR (1) | FR950281A (en) |
GB (1) | GB586782A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2938793A (en) * | 1957-12-23 | 1960-05-31 | Technical Operations Inc | Nitrosodisulfonate latensifier |
US3897255A (en) * | 1971-10-18 | 1975-07-29 | Monsanto Co | Photoimaging compositions comprising complex of prophyrin-SO{HD 2 {B as sensitizer |
US3899334A (en) * | 1971-10-18 | 1975-08-12 | Monsanto Co | Photoimaging procedures and compositions |
US3992209A (en) * | 1973-10-10 | 1976-11-16 | Monsanto Company | Imagewise distribution of sulfate group on substrate polymer by photographic techniques |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB128337A (en) * | 1918-04-20 | 1919-06-20 | Ilford Ltd | Improvements in or relating to High-temperature Development of Photographic Materials. |
US1850162A (en) * | 1929-05-11 | 1932-03-22 | Agfa Ansco Corp | Fixing bleaching-out pictures |
US1973446A (en) * | 1934-01-23 | 1934-09-11 | Brer A E Resenquist | Cable guiding device |
US2146802A (en) * | 1937-05-29 | 1939-02-14 | Agfa Ansco Corp | Dry hypersensitizing of photographic emulsions |
DE714714C (en) * | 1937-06-20 | 1941-12-05 | Ig Farbenindustrie Ag | Process for hardening proteins |
US2201591A (en) * | 1939-05-11 | 1940-05-21 | Cmc Corp | Photographic processing |
US2311103A (en) * | 1941-11-13 | 1943-02-16 | Eastman Kodak Co | Photographic silver halide emulsion |
US2368267A (en) * | 1943-06-09 | 1945-01-30 | Eastman Kodak Co | Latent image intensification with sulphur dioxide |
-
1944
- 1944-11-08 GB GB21984/44A patent/GB586782A/en not_active Expired
-
1945
- 1945-07-26 US US607273A patent/US2437412A/en not_active Expired - Lifetime
-
1946
- 1946-08-28 FR FR950281D patent/FR950281A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR950281A (en) | 1949-09-22 |
US2437412A (en) | 1948-03-09 |
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