Process of forming super high-contrast negative images and silve

Details Process of forming super high-contrast negative images and silve Process of forming super high-contrast negative images and silve

1996-09-12

1997-11-04

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430440, 430446, 430480, 430483, G03C 5305

Patent

active

056838549

ABSTRACT:
An image-forming process developing a previously image-exposed silver halide photographic material with an alkaline developer containing a reductone compound as a main developing agent in the presence of a 1,2,5-thiadiazole compound and/or a 2,1,3-benzothiadiazole compound, and the silver halide photographic material and the photographic developer being used for the process are disclosed. In this case, the 1,2,5-thuiadiazole compound and/or the 2,1,3-benzothiadiazole may be contained in the silver halide photographic material and/or the alkaline developer. Super high-contrast images for photomechanical process having a gamma of higher than 15 and having no pepper and less fog can be obtained.

REFERENCES:
patent: 3623873 (1971-11-01), Brown et al.
patent: 5196298 (1993-03-01), Meeur et al.
patent: 5217842 (1993-06-01), Kojima et al.
patent: 5278035 (1994-01-01), Knapp
patent: 5284733 (1994-02-01), Kojima et al.
patent: 5372911 (1994-12-01), Obi et al.

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