GB487602A - Improvements in the production of photographic reversal images - Google Patents

Improvements in the production of photographic reversal images

Info

Publication number
GB487602A
GB487602A GB31562/36D GB3156236D GB487602A GB 487602 A GB487602 A GB 487602A GB 31562/36 D GB31562/36 D GB 31562/36D GB 3156236 D GB3156236 D GB 3156236D GB 487602 A GB487602 A GB 487602A
Authority
GB
United Kingdom
Prior art keywords
photographic
coh
dec
compounds
development
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
GB31562/36D
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB487602A publication Critical patent/GB487602A/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

Abstract

487,602. Photographic developing compositions and reversal processes. I. G. FARBENINDUSTRIE AKT.-GES. Dec. 22, 1936, No. 35162. Convention date, Dec. 23, 1935. [Class 98 (ii)] In a photographic reversal process in which the image is blackened directly by the second development without intermediate exposure, a compound is used for the second development, either with or without an ordinary developer, which contains in an open chain or heterocyclic nucleus the atom grouping -CO-C(OH)- or -COH=COH-. Dioxindol, benzoin, and dioxythionaphthene, and their substitution products, and benzoin sulphonic acid, are examples of such compounds. Examples of compositions incorporating such compounds are furnished. The use of sodium hydrosulphite and thiosinamine is referred to.
GB31562/36D 1935-12-23 1936-12-22 Improvements in the production of photographic reversal images Expired GB487602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2122599X 1935-12-23

Publications (1)

Publication Number Publication Date
GB487602A true GB487602A (en) 1938-06-22

Family

ID=7985988

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31562/36D Expired GB487602A (en) 1935-12-23 1936-12-22 Improvements in the production of photographic reversal images

Country Status (3)

Country Link
US (1) US2122599A (en)
FR (1) FR815342A (en)
GB (1) GB487602A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE573379A (en) * 1957-11-29
US3476317A (en) * 1967-10-30 1969-11-04 Harold Gassner Rail fasteners

Also Published As

Publication number Publication date
US2122599A (en) 1938-07-05
FR815342A (en) 1937-07-09

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