Direct-positive silver halide photographic sensitive materials

Details Direct-positive silver halide photographic sensitive materials Direct-positive silver halide photographic sensitive materials

1979-09-24

1981-06-16

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430411, 430949, 430596, 430597, 430589, 430582, 430583, 430585, 430586, 430587, 430581, G03C 524

Patent

active

042738628

ABSTRACT:
Direct-positive silver halide photographic sensitive materials of high sensitivity and capable of forming a high-contrast image are obtained by incorporating anion-type cyanine dyes having a polarographic oxidation halfwave potential not less positive than +0.4 V in externally fogged direct-positive silver halide emulsions containing not less than 70 mole-% of bromide. Additional incorporation of a development accelerator such as 2-mercaptoimidazoline improves developability.

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Berriman, et al: "Spectral Sensitization of Mobile Positive Holes," Photographic Science and Engr., vol. 17, pp. 235-244, 1973.

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