Silver halide photographic material and method of forming high c

Details Silver halide photographic material and method of forming high c Silver halide photographic material and method of forming high c

1980-06-10

1982-05-11

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430599, 430600, 430601, 430603, 430604, 430607, 430608, 430610, 430612, 430613, 430949, 430438, G03C 530, G03C 106

Patent

active

043294170

ABSTRACT:
A novel method of forming high contrast silver images is provided. The method comprises steps of (1) imagewisely exposing a light-sensitive silver halide photographic material, and (2) treating the exposed material with a developer having superadditivity. The method is characterized by the co-existence of an oxidizing agent, and a water-insoluble ion pair formed by a water-soluble cationic compound such as quaternary ammonium or tertiary sulfonium salt and a water-soluble anionic compound such as organic sulfate. The method realizes high contrast photographic images by using a developer having a good preservability, without contamination of the developer, within a short period of time for the development. There is also provided a light-sensitive silver halide photographic material herein.

REFERENCES:
patent: 3891442 (1975-06-01), Beavers
patent: 4010036 (1977-03-01), Suga et al.
patent: 4192682 (1980-03-01), Nishina et al.
patent: 4233400 (1980-11-01), Fujiwhara et al.
patent: 4237214 (1980-12-01), Mifune et al.
patent: 4247620 (1981-01-01), Nagatani et al.

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