Process for high contrast development of photographic elements

Details Process for high contrast development of photographic elements Process for high contrast development of photographic elements

1985-11-15

1987-09-15

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430265, 430266, 430267, 430268, 430438, 430468, 430481, 430490, 430599, 430949, G03C 524, G03C 106, G03C 100, G03C 530

Patent

active

046939563

ABSTRACT:
A process is disclosed for forming a high-contrast photographic image by developing a silver halide photographic element, including at least a silver halide emulsion layer, with an aqueous alkaline developing solution containing a dihydroxybenzene developing agent, a superadditive developing agent and an antioxidant at a pH of less than 12 in the presence of a hydrazine compound, an organic antifogging and contrast promoting agent selected within the class including a benzotriazole compound and a benzimidazole compound and a non polymeric hydroxymethylidyne group containing compound of formula: ##STR1## wherein R.sub.1 and R.sub.2 each independently represent a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, or R.sub.1 and R.sub.2 together complete a non aromatic cyclic group.

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patent: 4272606 (1981-06-01), Mifune et al.
patent: 4272614 (1981-06-01), Mifune et al.
patent: 4323643 (1982-04-01), Mifune et al.

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