High contrast photographic materials

Details High contrast photographic materials High contrast photographic materials

1988-03-29

1991-11-26

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430422, 430608, G03C 134

Patent

active

050681672

ABSTRACT:
Pepper fog may be reduced in high contrast photographic materials comprising silver halide emulsion in association with a hydrazine by the presence of at least 0.001 mole per mole of silver halide of a water-soluble bromide and/or water-soluble chloride. Suitable water-soluble bromides and chlorides are alkali metal bromides and chlorides which are advantageously added to the silver halide emulsion after physical ripening and washing.

REFERENCES:
patent: 2935405 (1960-05-01), Sottysiak
patent: 4221857 (1980-09-01), Okutsu et al.
patent: 4385108 (1983-05-01), Takagi et al.
patent: 4536473 (1985-08-01), Mihara
patent: 4560638 (1985-12-01), Loblaw et al.
patent: 4618574 (1986-10-01), Cavallaro

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