Direct positive dimethine cyanine dyes containing 1-aryl-2-heter

Details Direct positive dimethine cyanine dyes containing 1-aryl-2-heter Direct positive dimethine cyanine dyes containing 1-aryl-2-heter

1987-06-26

1989-06-13

Shah, Mukund J.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430581, 430597, 430940, G03C 100, G03C 102

Patent

active

048392715

ABSTRACT:
A fogged direct positive photographic silver halide emulsion containing a sensitizing amount of at least one cyanine dye defined above, e.g., cyanine dye containing a 1-phenylindole nucleus substituted in the 2-position with the 3-pyridyl group. The said cyanine dye is also covered. The dye useful in sensitizing the silver halide emulsion useful for fogged direct-positive films.

REFERENCES:
patent: 3501312 (1970-03-01), Mee et al.
patent: 3505070 (1970-04-01), Litzerman et al.
patent: 3580911 (1971-05-01), Mee et al.
patent: 3592653 (1971-07-01), Fumia et al.
patent: 3598596 (1971-08-01), Chapman

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