Novel sensitizers and their use in direct-positive photographic

Details Novel sensitizers and their use in direct-positive photographic Novel sensitizers and their use in direct-positive photographic

1980-07-11

1982-01-19

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430574, 430596, 430597, 430412, 542434, 542435, 542436, 26032615, 260239R, 546176, 546121, 544345, 548156, 548146, 548219, 548328, 430573, G03C 524, G03C 136

Patent

active

043117864

ABSTRACT:
Direct-positive photographic material which has at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure and, as a sensitizer, a trinuclear tetramethinecyanine dye in which all or some of the methine hydrogen atoms have been replaced by fluorine, chlorine, bromine or iodine atoms. The novel trinuclear tetramethinecyanine dyes impart an excellent blue-sensitivity to the photographic materials. Furthermore, high maximum densities and very low minimum densities are achieved.

REFERENCES:
patent: Re29930 (1979-03-01), Illingsworth
patent: 3501309 (1970-03-01), Gilman et al.

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