GB586782A - Improvements relating to photographic materials - Google Patents

Improvements relating to photographic materials

Info

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
Application number
GB21984/44A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to GB21984/44A priority Critical patent/GB586782A/en
Priority to US607273A priority patent/US2437412A/en
Priority to FR950281D priority patent/FR950281A/en
Publication of GB586782A publication Critical patent/GB586782A/en
Expired legal-status Critical Current

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.
GB21984/44A 1944-11-08 1944-11-08 Improvements relating to photographic materials Expired GB586782A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
US2437412A (en) 1948-03-09
FR950281A (en) 1949-09-22

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