GB494468A - Improvements in or relating to photographic developers and processes of development - Google Patents

Improvements in or relating to photographic developers and processes of development

Info

Publication number
GB494468A
GB494468A GB35430/37A GB3543037A GB494468A GB 494468 A GB494468 A GB 494468A GB 35430/37 A GB35430/37 A GB 35430/37A GB 3543037 A GB3543037 A GB 3543037A GB 494468 A GB494468 A GB 494468A
Authority
GB
United Kingdom
Prior art keywords
aminopyridine
development
processes
relating
chloro
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
GB35430/37A
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.)
Bayer Pharma AG
Original Assignee
Schering 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 Schering AG filed Critical Schering AG
Publication of GB494468A publication Critical patent/GB494468A/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
    • G03C5/29—Development processes or agents therefor
    • G03C5/305—Additives other than developers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pyridine Compounds (AREA)

Abstract

494,468. Photographic developing processes. SCHERING AKT.-GES. Dec. 21, 1937, No. 35430. Convention date, Dec. 21, 1936. [Class 98 (ii)] In the development of silver halide emulsions, a developing composition containing a halogen-substituted aminopyridine or a salt thereof is used to obtain blue-black tones. In a modification the emulsion may be treated with a solution of the halogen-substituted aminopyridine prior to development. Aminopyridines referred to are 5-iodo-2-aminopyridine, 5 - bromo - 2 - aminopyridine, 5 - chloro- 2 - aminopyridine, 5 - chloro - 2- acetylaminopyridine, 3: 5 - dichloro - 2 - aminopyridine and 3:5 - dibromo - 2 - aminopyridine. The use of 2 : 4 : 6 - trimethylpyridine is also referred to. Examples of suitable developing compositions are given.
GB35430/37A 1936-12-21 1937-12-21 Improvements in or relating to photographic developers and processes of development Expired GB494468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE494468X 1936-12-21

Publications (1)

Publication Number Publication Date
GB494468A true GB494468A (en) 1938-10-26

Family

ID=6544720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35430/37A Expired GB494468A (en) 1936-12-21 1937-12-21 Improvements in or relating to photographic developers and processes of development

Country Status (4)

Country Link
US (1) US2192891A (en)
BE (1) BE425342A (en)
FR (1) FR830985A (en)
GB (1) GB494468A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465678A (en) * 1947-03-19 1949-03-29 Donald B Ellig Machine for sharpening knife blades
US2476541A (en) * 1947-11-18 1949-07-19 Gen Aniline & Film Corp Process for producing multilayer color negatives containing masking images for colorcorrection purposes
US2983605A (en) * 1955-01-31 1961-05-09 Polaroid Corp Photographic products, processes, and compositions

Also Published As

Publication number Publication date
BE425342A (en)
FR830985A (en) 1938-08-16
US2192891A (en) 1940-03-12

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