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GB539509A - Improvements in or relating to the production of colour photographs - Google Patents

Improvements in or relating to the production of colour photographs

Info

Publication number
GB539509A
GB539509A GB602/40A GB60240A GB539509A GB 539509 A GB539509 A GB 539509A GB 602/40 A GB602/40 A GB 602/40A GB 60240 A GB60240 A GB 60240A GB 539509 A GB539509 A GB 539509A
Authority
GB
United Kingdom
Prior art keywords
dye
acid
image
silver
tetrazotized
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
GB602/40A
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 GB602/40A priority Critical patent/GB539509A/en
Priority to US364548A priority patent/US2322084A/en
Priority to DEK160042D priority patent/DE735672C/en
Publication of GB539509A publication Critical patent/GB539509A/en
Priority to FR876360D priority patent/FR876360A/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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

539,509. Coloured photographic images. KODAK, Ltd. (Eastman Kodak Co.). Jan. 11, 1940, No. 602. [Class 98 (ii)] In the production of a coloured photographic image in an exposed silver salt emulsion containing a dye capable of being de-colourized by reduction by means of the silver dye-bleaching process, the image-forming dye, after development but without fixing, is bleached locally in a single bath which contains free acid and a mild oxidizing agent whereby it dissolves all silver salt and silver in the layer. The dye image may be produced with a pre-determined contrast by the selection of a suitable amount of mild oxidizing agent. The dye is preferably an azo dye, and the free acid may be hydrochloric, hydrobromic, hydroiodic, nitric, or phosphoric acid. The oxidizing agents include ferric chloride, potassium ferricyanide, ammonium vanadate, vanadyl chloride, potassium nitrate, and soluble nitro or nitroso compounds or azo dyes. Catalysts such as 2-hydroxy-3-aminophenazine or 2:3-dimethylquinoxaline may be used. Numerous examples of dye-destruction baths are given, all of which include potassium thiocyanate or thiourea. The dyes for a threelayer film may be (a) the yellow dye from tetrazotized tolidine-disulphonic acid coupled with 2-chloro-5-hydroxytoluene, (b) the magenta dye from tetrazotized 2:5:2<SP>1</SP>:5<SP>1</SP>-tetraethyl-4:4<SP>1</SP>-diaminotriphenylmethane coupled with acetyl H-acid, and (c) a blue-green dye whose preparation is given.
GB602/40A 1940-01-11 1940-01-11 Improvements in or relating to the production of colour photographs Expired GB539509A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB602/40A GB539509A (en) 1940-01-11 1940-01-11 Improvements in or relating to the production of colour photographs
US364548A US2322084A (en) 1940-01-11 1940-11-06 Simultaneous bleaching and fixing bath
DEK160042D DE735672C (en) 1940-01-11 1941-02-05 Combined bleaching and fixing bath
FR876360D FR876360A (en) 1940-01-11 1941-10-27 Improvements in obtaining color photographs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB602/40A GB539509A (en) 1940-01-11 1940-01-11 Improvements in or relating to the production of colour photographs

Publications (1)

Publication Number Publication Date
GB539509A true GB539509A (en) 1941-09-15

Family

ID=9707267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB602/40A Expired GB539509A (en) 1940-01-11 1940-01-11 Improvements in or relating to the production of colour photographs

Country Status (4)

Country Link
US (1) US2322084A (en)
DE (1) DE735672C (en)
FR (1) FR876360A (en)
GB (1) GB539509A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156561A (en) * 1958-06-03 1964-11-10 Ciba Geigy Corp Method of producing color photographic pictures

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565146A (en) * 1943-06-23 1944-10-27 Eastman Kodak Co Improvements relating to photographic fixing solutions
DE947221C (en) * 1944-03-03 1956-08-09 Agfa Ag Fuer Photofabrikation Process for the simultaneous bleaching and fixing of chromogenically developed color images
US2434272A (en) * 1944-05-03 1948-01-13 Eastman Kodak Co Color photography with azosubstituted couplers
US2494765A (en) * 1944-11-10 1950-01-17 Keuffel & Esser Co Chemical erasing of photographic silver images
US2756151A (en) * 1952-08-01 1956-07-24 Eastman Kodak Co Reduction of dye stain in processed photographic papers containing dyes
DE1039839B (en) * 1957-07-04 1958-09-25 Agfa Ag Process for the production of color images by the silver dye bleaching process using azo dyes
DE1041355B (en) * 1957-07-05 1958-10-16 Agfa Ag Process for the production of color images by the silver dye bleaching process using azo dyes
DE1039840B (en) * 1957-07-13 1958-09-25 Agfa Ag Process for the production of color images by the silver dye bleaching process using azo dyes
BE626198A (en) * 1961-12-20
US3520688A (en) * 1967-05-25 1970-07-14 Itek Corp Photographic process comprising improved dye bleaching step
CH511456A (en) * 1969-07-30 1971-08-15 Ciba Geigy Ag Process for removing metallic silver from photographic material
US3773510A (en) * 1971-06-26 1973-11-20 Minnesota Mining & Mfg Additives to bleach/fix baths
CH584914A5 (en) * 1973-10-12 1977-02-15 Ciba Geigy Ag
CH594912A5 (en) * 1974-07-10 1978-01-31 Ciba Geigy Ag
JPS522433A (en) * 1975-06-23 1977-01-10 Fuji Photo Film Co Ltd Single bath color element silver branching liquid
US4125402A (en) * 1976-08-19 1978-11-14 Ciba-Geigy Ag Method of processing silver dye bleaching materials and preparations suitable for the dye and silver bleaching
CH627006A5 (en) * 1977-03-23 1981-12-15 Ciba Geigy Ag
US4304846A (en) * 1979-02-09 1981-12-08 Ciba-Geigy Ag Method for processing silver dye-bleach materials
US6221570B1 (en) * 2000-01-06 2001-04-24 Trebla Chemical Company One-part bleach-fix liquid concentrates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156561A (en) * 1958-06-03 1964-11-10 Ciba Geigy Corp Method of producing color photographic pictures

Also Published As

Publication number Publication date
US2322084A (en) 1943-06-15
DE735672C (en) 1943-05-24
FR876360A (en) 1942-11-04

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