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AssigneeDainippon Ink and Chemicals, Inc.
InventorsKiyoshi Suematsu, Hiroaki Muratake, Haruhiko Kaji, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu
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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.
A process of forming super high-contrast negative images, which comprises after imagewise exposing a negative-working surface latent image-type silver halide photographic material comprising a support having thereon at least one negative-working silver halide emulsion layer, developing the silver halide photographic material with an alkaline developer containing at least one reductone compound in an amount of from 1 g to 200 g per liter of the developer, (2) an auxiliary developing agent in an amount of from. 0.2 g to 20 g per liter of the developer, (3) an antifoggant in an amount of from 1 mg to 10 g per liter of the developer, and (4) a borate compound in an amount of from 1 g to 250 g per liter of the developer, in the presence of at least one kind of a 1,2,5-thiadiazole compound and/or a 2, 1,3-benzothiadiazole compound;
Dependencies are inferred from the claim text.