发明授权
US4599300A Direct positive silver halide photographic emulsions 失效
直接正卤化银照相乳剂

Direct positive silver halide photographic emulsions
摘要:
There is provided a high speed and high contrast direct positive silver halide photographic emulsion which is free of discoloration by containing therein a dimethine dye having an indolenine ring which contains a cyano group as a substituent.
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