Direct positive silver halide photographic materials

Details Direct positive silver halide photographic materials Direct positive silver halide photographic materials

1983-12-19

1985-09-03

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430596, 430598, 430940, 430606, G03C 136

Patent

active

045392919

ABSTRACT:
A direct positive silver halide material is disclosed. The material is comprised of a support base having a silver halide emulsion layer thereon which contains at least one phenazine series compound represented by the general formula (I), (II) or (III) and at least one compound represented by the general formula (IV), (V) or (VI). The structural formulae are shown within the specification wherein their substituents are defined. By including one compound of each of these groups within the material the resulting material provides images with a reduced minimum density without reducing the contrast of the images formed.

REFERENCES:
patent: 3035917 (1962-05-01), Fry et al.
patent: 3124458 (1964-03-01), Fry et al.
patent: 3184313 (1965-05-01), Rees et al.
patent: 3326687 (1967-06-01), Kalenda
patent: 3403025 (1968-09-01), Rees et al.
patent: 3658547 (1972-04-01), Shiba et al.
patent: 3945832 (1976-03-01), Shiba et al.

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