GB608667A - Improvements in or relating to photographic emulsions - Google Patents

Improvements in or relating to photographic emulsions

Info

Publication number
GB608667A
GB608667A GB3261645A GB3261645A GB608667A GB 608667 A GB608667 A GB 608667A GB 3261645 A GB3261645 A GB 3261645A GB 3261645 A GB3261645 A GB 3261645A GB 608667 A GB608667 A GB 608667A
Authority
GB
United Kingdom
Prior art keywords
emulsions
emulsion
gold
thiocyanate
cyanide
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
GB3261645A
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.)
ERIC GEORGE VICTORY BARRETT
PHILIP GEORGE PARNELL
Elliott and Sons Ltd
Original Assignee
ERIC GEORGE VICTORY BARRETT
PHILIP GEORGE PARNELL
Elliott and Sons 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 ERIC GEORGE VICTORY BARRETT, PHILIP GEORGE PARNELL, Elliott and Sons Ltd filed Critical ERIC GEORGE VICTORY BARRETT
Priority to GB3261645A priority Critical patent/GB608667A/en
Publication of GB608667A publication Critical patent/GB608667A/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
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising
    • 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
    • G03C2001/03511—Bromide content
    • 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
    • G03C2200/00—Details
    • G03C2200/44—Details pH value

Abstract

608,667. Photographic emulsions. ELLIOTT & SONS, Ltd., BARRETT, E. G. V., HOWE, D. J. T., and PARNELL, P. G. Dec. 3, 1945, No. 32616. [Class 98 (ii)] A small quantity of a water-insoluble gold compound in the form of a colloidal suspension is introduced to a gelatino-silver halide emulsion before or during final digestion to increase the sensitivity to light. The quantity is not intended to exceed the equivalent of 0.007 grams of metallic gold per litre of emulsion, and the silver halide concerned is principally silver bromide. A precipitating agent such as ammonia, pyridine, piperidine, triethanolamine, triethylamine, silver nitrate, thallous nitrate or lead acetate may be added to a gelatine sol containing sodium chloroaurate or potassium bromoaurate, or should the gold salt employed be a complex, cyanide, or thiocyanate, the precipitating agent may be an ammonium base or a salt of a metal which forms an insoluble cyanide or thiocyanate, and the resulting colloidal suspension of gold compound is set, shredded, washed to remove soluble salts, remelted and is then ready for addition to the emulsion. The emulsions should be made from normal gelatines containing sulphur compounds, otherwise, sulphur compounds' as described in Specification 539,355 should be added; and hardening agents, preservatives, stabilisers or optical sensitisers may be included. Six examples enumerate the improvement in speed, as compared with normal emulsions, which results. Specification 570,393 also is referred to.
GB3261645A 1945-12-03 1945-12-03 Improvements in or relating to photographic emulsions Expired GB608667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3261645A GB608667A (en) 1945-12-03 1945-12-03 Improvements in or relating to photographic emulsions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3261645A GB608667A (en) 1945-12-03 1945-12-03 Improvements in or relating to photographic emulsions

Publications (1)

Publication Number Publication Date
GB608667A true GB608667A (en) 1948-09-20

Family

ID=10341387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3261645A Expired GB608667A (en) 1945-12-03 1945-12-03 Improvements in or relating to photographic emulsions

Country Status (1)

Country Link
GB (1) GB608667A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597915A (en) * 1949-09-24 1952-05-27 Eastman Kodak Co Stabilization of photographic emulsions sensitized with gold compounds
US2597856A (en) * 1949-09-24 1952-05-27 Eastman Kodak Co Stabilization of photographic emulsions sensitized with gold compounds
US2642361A (en) * 1949-07-20 1953-06-16 Eastman Kodak Co Photographic silver halide emulsions sensitized with water-insoluble gold compounds

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642361A (en) * 1949-07-20 1953-06-16 Eastman Kodak Co Photographic silver halide emulsions sensitized with water-insoluble gold compounds
US2597915A (en) * 1949-09-24 1952-05-27 Eastman Kodak Co Stabilization of photographic emulsions sensitized with gold compounds
US2597856A (en) * 1949-09-24 1952-05-27 Eastman Kodak Co Stabilization of photographic emulsions sensitized with gold compounds

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