Process for the formation of high contrast negative images and s

Details Process for the formation of high contrast negative images and s Process for the formation of high contrast negative images and s

1987-02-04

1988-10-11

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430265, 430268, 430439, 430949, G03C 106, G03C 142, G03C 526

Patent

active

047771186

ABSTRACT:
High contrast negative images are obtained by developing a silver halide photographic element, in the presence of a hydrazine compound, with an alkali aqueous developing solution which contains a combination of developing agent comprising hydroquinone or substituted hydroquinone and a superadditive developing agent and an antioxidant, wherein the developing solution has a pH lower than about 12 and wherein the silver halide photographic element comprises an emulsion layer including surface latent image negative type silver halide grains in reactive association with a contrast promoting agent, preferably a diarylcarbinol compound, more preferably a diarylmethanol compound in a quantity useful to increase contrast.

REFERENCES:
patent: Re29111 (1977-01-01), Masseth
patent: 3793027 (1974-02-01), Okutsu et al.
patent: 4022621 (1977-05-01), Hayashi et al.
patent: 4269929 (1981-05-01), Nothnagle
patent: 4272606 (1981-06-01), Mifune et al.
patent: 4560638 (1985-12-01), Loblaw et al.
patent: 4619886 (1986-10-01), Okutsu

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