GB904462A - Improved photographic processes - Google Patents

Improved photographic processes

Info

Publication number
GB904462A
GB904462A GB38748/58A GB3874858A GB904462A GB 904462 A GB904462 A GB 904462A GB 38748/58 A GB38748/58 A GB 38748/58A GB 3874858 A GB3874858 A GB 3874858A GB 904462 A GB904462 A GB 904462A
Authority
GB
United Kingdom
Prior art keywords
colour
potassium
developer
borohydride
specifications
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
GB38748/58A
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.)
Kodak Ltd
Original Assignee
Kodak Ltd
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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB904462A publication Critical patent/GB904462A/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
    • G03C5/50—Reversal development; Contact processes

Landscapes

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

Abstract

904,462. Photographic processes. KODAK Ltd. Dec. 1, 1958 [Nov. 29, 1957], No. 38748/58. Class 98 (2). In reversal processing of colour or black and white material, an aqueous solution of an alkali metal borohydride is used as a chemical fogging agent to form the reversal latent image. In an example, an exposed silver chlorobromide emulsion is developed in a hydroquinone developer containing paraformaldehyde and bleached with potassium permanganate. After cleaning with a sodium bisulphite solution, the emulsion is treated with a 1% alkaline solution of potassium borohydride. The whole of the remaining silver halide is immediately reduced to silver. An example of reversal processing of a tri-pack colour film having layers containing colour couplers is also given. The steps include development with an N-methyl-p-aminophenol developer and hardening with an aqueous solution of potassium chrome alum. Sodium borohydride is applied in a 0.025% alkaline solution for 30 seconds in order to render all the remaining silver halide developable by means of a colour forming developer of specified composition. The Specification refers to the prior use of aromatic hydrazines as fogging agents. Specifications 651,749, 653,284, 702,162, 728,368 and U.S.A. Specifications 2,266,443, 2,272,191, 2,552,240, 2,552,241 and 2,552,242 are referred to.
GB38748/58A 1957-11-29 1958-12-01 Improved photographic processes Expired GB904462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US699478A US2984567A (en) 1957-11-29 1957-11-29 Method for elimination of reversal reexposure in processing photographic films

Publications (1)

Publication Number Publication Date
GB904462A true GB904462A (en) 1962-08-29

Family

ID=24809510

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38748/58A Expired GB904462A (en) 1957-11-29 1958-12-01 Improved photographic processes

Country Status (4)

Country Link
US (1) US2984567A (en)
BE (1) BE573379A (en)
FR (1) FR1221623A (en)
GB (1) GB904462A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168400A (en) * 1961-05-22 1965-02-02 Eastman Kodak Co Rapid processing of photographic color materials
BE634229A (en) * 1962-07-11
US3266895A (en) * 1963-11-14 1966-08-16 Eastman Kodak Co Method for processing multilayer color film
US3666648A (en) * 1969-11-05 1972-05-30 Ibm In-situ reclamation of master patterns for printing microcircuit images on reversely sensitized material
JP2777949B2 (en) 1992-04-03 1998-07-23 富士写真フイルム株式会社 Silver halide color photographic materials

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1628445A (en) * 1927-05-10 Georges emmanuel zelger
US1962348A (en) * 1929-11-13 1934-06-12 Eastman Kodak Co Photographic reversal process
US2122599A (en) * 1935-12-23 1938-07-05 Agfa Ansco Corp Photographic developers
NL83245B (en) * 1936-05-09
BE424514A (en) * 1936-11-10
US2339309A (en) * 1941-09-25 1944-01-18 Du Pont Photographic reducing composition and process
US2461661A (en) * 1945-01-09 1949-02-15 Hermann I Schlesinger Preparation of alkali metal compounds
US2766760A (en) * 1953-09-15 1956-10-16 Gillette Co Hair waving with borohydrides

Also Published As

Publication number Publication date
FR1221623A (en) 1960-06-02
US2984567A (en) 1961-05-16
BE573379A (en)

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