GB1452301A - Direct positive silver halide emulsions - Google Patents

Direct positive silver halide emulsions

Info

Publication number
GB1452301A
GB1452301A GB5385973A GB5385973A GB1452301A GB 1452301 A GB1452301 A GB 1452301A GB 5385973 A GB5385973 A GB 5385973A GB 5385973 A GB5385973 A GB 5385973A GB 1452301 A GB1452301 A GB 1452301A
Authority
GB
United Kingdom
Prior art keywords
silver halide
grains
positive silver
emulsions
fogged
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
GB5385973A
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.)
Agfa Gevaert NV
Agfa Gevaert AG
Original Assignee
Agfa Gevaert NV
Agfa Gevaert 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 Agfa Gevaert NV, Agfa Gevaert AG filed Critical Agfa Gevaert NV
Publication of GB1452301A publication Critical patent/GB1452301A/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
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/485—Direct positive emulsions
    • G03C1/48515—Direct positive emulsions prefogged

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

1452301 Photographic direct-positive silver halide emulsions AGFA-GEVAERT 20 Nov 1973 [8 Dec 1972] 53859/73 Heading G2C Photographic direct-positive silver halide emulsion of improved photo-sensitivity comprise silver halide grains which are fogged to a degree as defined in the Specification, which are monodisperse i.e. have a grain size distribution such that at least 95% by weight of the silver halide grains do not differ by more than 40% from the average grain size, and which have a silver iodide content of 1 0 to 20 mol. per cent. The grains may have interior electron traps and may be core and shell grains in which the cores may be sensitized with noble metal and/or sulphur compounds or by reduction and the shells are fogged. The emulsions may contain developing agents and in processing the activator or developer solutions may be free from halide ions. The processing solution may be applied as a viscous solution e.g. from a rupturable container. Specification 1452302 is referred to.
GB5385973A 1972-12-08 1973-11-20 Direct positive silver halide emulsions Expired GB1452301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722260116 DE2260116A1 (en) 1972-12-08 1972-12-08 PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE IMAGES

Publications (1)

Publication Number Publication Date
GB1452301A true GB1452301A (en) 1976-10-13

Family

ID=5863888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5385973A Expired GB1452301A (en) 1972-12-08 1973-11-20 Direct positive silver halide emulsions

Country Status (6)

Country Link
JP (1) JPS4990921A (en)
BE (1) BE808025A (en)
DE (1) DE2260116A1 (en)
FR (1) FR2209948B1 (en)
GB (1) GB1452301A (en)
IT (1) IT1019036B (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501305A (en) * 1966-03-11 1970-03-17 Eastman Kodak Co Monodispersed photographic reversal emulsions

Also Published As

Publication number Publication date
DE2260116A1 (en) 1974-06-12
IT1019036B (en) 1977-11-10
JPS4990921A (en) 1974-08-30
BE808025A (en) 1974-05-30
FR2209948B1 (en) 1978-12-22
FR2209948A1 (en) 1974-07-05

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee