Method for increasing the contrast of photographic silver images

Details Method for increasing the contrast of photographic silver images Method for increasing the contrast of photographic silver images

1991-12-17

1993-11-30

Van Le, Hoa

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

Process using lithographic infectious developer

430268, 430435, 430436, 430438, 430478, 430481, 430482, 430564, 430603, 430604, 430605, G03C 529

Patent

active

052664422

ABSTRACT:
A method for the production of a silver image with improved contrast by the development of an image-wise exposed photographic silver halide emulsion layer material with a developer liquid containing a hydroquinone in the presence of an auxiliary developing agent, wherein said developer liquid is applied to said photographic material containing silver halide grains that have been chemically sensitized with organic thiosulphonic acid anions in combination with a gold sensitizer in the absence of thiosulphate ions.

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patent: 4269929 (1981-05-01), Nothnagle
patent: 4693965 (1987-09-01), Ihama et al.
patent: 4833064 (1989-05-01), Okutsu et al.
patent: 4965169 (1990-10-01), Hirano et al.
patent: 5009992 (1991-04-01), Friedrich et al.
patent: 5061614 (1991-10-01), Takada et al.
patent: 5079138 (1992-01-01), Takada

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