High contrast development of silver halide emulsion material

Details High contrast development of silver halide emulsion material High contrast development of silver halide emulsion material

1986-03-24

1987-12-01

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Developing

430266, 430444, 430466, 430489, G03C 524, G03C 106, G03C 134

Patent

active

047104511

ABSTRACT:
A high contrast silver metal image can be formed in an exposed photographic silver halide emulsion layer material, the silver halide of which is at least 90 mole percent silver bromide, with the balance being silver chloride and/or silver iodide by developing the same in a developing medium in the presence of hydroquinone as sole developing agent, a large amount of sulphite derived from an inorganic sulphite compound, a nitro-indazole anti-fogging agent, and a polyoxyethylene polymer, and an inorganic alkaline compound to impart to the medium a pH of at least 10.5 provided the amounts of these ingredients meets certain requirements.

REFERENCES:
patent: 2948612 (1960-08-01), De Angelus et al.
patent: 2952539 (1960-09-01), Dersch et al.
patent: 2955036 (1960-10-01), Dersch et al.
patent: 3271154 (1966-09-01), Dersch et al.
patent: 3947273 (1976-03-01), Pollet et al.
patent: 3972719 (1976-08-01), Vanreusel et al.
patent: 4273862 (1981-06-01), Yoshida et al.

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