GB635849A - Improvements in sensitive photographic materials - Google Patents

Improvements in sensitive photographic materials

Info

Publication number
GB635849A
GB635849A GB2361647A GB2361647A GB635849A GB 635849 A GB635849 A GB 635849A GB 2361647 A GB2361647 A GB 2361647A GB 2361647 A GB2361647 A GB 2361647A GB 635849 A GB635849 A GB 635849A
Authority
GB
United Kingdom
Prior art keywords
emulsion
type
emulsions
developer
latent image
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
GB2361647A
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
Priority to GB2361647A priority Critical patent/GB635849A/en
Publication of GB635849A publication Critical patent/GB635849A/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
    • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • 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
    • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • G03C2001/03564—Mixed grains or mixture of emulsions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

635,849. Sensitive photographic material. KODAK, Ltd., and KNOTT, E. B. Aug. 26, 1947, No. 23616. [Class 98 (ii)] The tendency for a visible image to develop in a " Type I " emulsion (i.e. one which forms latent image mostly inside the grains) on development in a surface developer is reduced or eliminated by mixing with such enulsion before coating and exposure, up to 15 per cent, a less sensitive emulsion of any type (calculated as the silver contents of the two emulsions), the relative speeds of the two emulsions being such that when both emulsions are exposed to the amount of light necessary to produce substantially maximum density in the more sensitive emulsion in a specified internal developer which includes metal, hydroquinone, and hypo for 4 minutes at 20‹ C.., the less sensitive emulsion gives no measurable density when treated for 4 minutes at 20‹ C. in the same developer without the hypo (i.e. a surface developer). The material may contain more than one " Type I emulsion, and these emulsions may have different colour sensitivities. In example 1, to 3500 ccs. of a fast " Type I emulsion made as described in example 1 of Specification 635,841 is added 500 ccs. of a " Type II " fine-grained slow silver chloride emulsion (i.e. one which forms latent image'mostly on the surface of the grains). In example 2, the procedure is similar, using a fine-grained slow silver bromide emulsion which forms both internal and surface latent image. Specifications 581,772 and 581,773 also are referred to.
GB2361647A 1947-08-26 1947-08-26 Improvements in sensitive photographic materials Expired GB635849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2361647A GB635849A (en) 1947-08-26 1947-08-26 Improvements in sensitive photographic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2361647A GB635849A (en) 1947-08-26 1947-08-26 Improvements in sensitive photographic materials

Publications (1)

Publication Number Publication Date
GB635849A true GB635849A (en) 1950-04-19

Family

ID=10198529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2361647A Expired GB635849A (en) 1947-08-26 1947-08-26 Improvements in sensitive photographic materials

Country Status (1)

Country Link
GB (1) GB635849A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418118A (en) * 1994-02-18 1995-05-23 Eastman Kodak Company Silver halide color photographic element with improved high density contrast and bright low density colors
US5512103A (en) * 1994-02-18 1996-04-30 Eastman Kodak Company Silver halide color photography element with improved high density contrast and bright low density colors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418118A (en) * 1994-02-18 1995-05-23 Eastman Kodak Company Silver halide color photographic element with improved high density contrast and bright low density colors
US5512103A (en) * 1994-02-18 1996-04-30 Eastman Kodak Company Silver halide color photography element with improved high density contrast and bright low density colors

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