发明名称 |
Direct positive silver halide photographic material and method for forming high contrast positive image using the same |
摘要 |
A direct positive silver halide photographic material and a method for forming a high contrast image using the same are disclosed, in which a pre-fogged direct positive silver halide emulsion layer contains a salt of a nitrogen-containing compound having at least one pyridine nucleus and at least one pyridinium nucleus. The photographic material, after imagewise exposure, is developed with an alkaline developer containing a developing agent, preferably a reductance compound. The photographic material provides high contrast characteristics having a gamma exceeding 10.
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申请公布号 |
US5362621(A) |
申请公布日期 |
1994.11.08 |
申请号 |
US19930107893 |
申请日期 |
1993.08.18 |
申请人 |
DAINIPPON INK AND CHEMICALS, INC. |
发明人 |
OBI, NAOKI;SUEMATSU, KIYOSHI;KOJIMA, YASUHIKO;KATAYAMA, MASATOSHI;SHIGEMITSU, YASUO |
分类号 |
G03C1/485;(IPC1-7):G03C1/485 |
主分类号 |
G03C1/485 |
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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