Direct positive silver halide photographic emulsions

Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Positive

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430581, 430596, G03C 524, G03C 102

Patent

active

045993009

ABSTRACT:
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.

REFERENCES:
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patent: 3846137 (1974-11-01), Riester et al.
patent: 3941602 (1976-03-01), Depoorter et al.
patent: 3945832 (1976-03-01), Shiba et al.
patent: 4175965 (1979-11-01), Yoshida et al.
patent: 4259439 (1981-03-01), Tanaka et al.
patent: 4510235 (1985-04-01), Ukai et al.

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