发明名称 |
Process for the formation of high contrast negative images and silver halide photographic element |
摘要 |
High contrast negative images are obtained by developing a silver halide photographic element, in the presence of a hydrazine compound, with an alkali aqueous developing solution which contains a combination of developing agent comprising hydroquinone or substituted hydroquinone and a superadditive developing agent and an antioxidant, wherein the developing solution has a pH lower than about 12 and wherein the silver halide photographic element comprises an emulsion layer including surface latent image negative type silver halide grains in reactive association with a contrast promoting agent, preferably a diarylcarbinol compound, more preferably a diarylmethanol compound in a quantity useful to increase contrast.
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申请公布号 |
US4777118(A) |
申请公布日期 |
1988.10.11 |
申请号 |
US19870010770 |
申请日期 |
1987.02.04 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
KITCHIN, JONATHAN P.;MARCHESANO, CARLO |
分类号 |
G03C1/06;(IPC1-7):G03C1/06;G03C1/42;G03C5/26 |
主分类号 |
G03C1/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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