Direct-positive photographic material

Details Direct-positive photographic material Direct-positive photographic material

1980-01-10

1981-04-21

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430611, G03C 524, G03C 134

Patent

active

042633966

ABSTRACT:
An improvement in the stability of a direct positive emulsion layer in photographic material is obtained by the inclusion of a compound which provides in the image-wise exposed and developed direct positive emulsion layer a greater difference between the density of the image in the unexposed parts of the layer and the density in the exposed parts. The compound provides in the emulsion a characteristic curve related to a density value at maximum density which is at least twice the analogous density value at minimum density.

REFERENCES:
patent: 2453346 (1948-11-01), Russell
patent: 3598598 (1971-08-01), Herz
patent: 3730723 (1973-05-01), Gilman et al.
patent: 3733198 (1973-05-01), Vanreusel et al.
patent: 3761266 (1973-09-01), Milton
patent: 3935014 (1976-01-01), Klotzer et al.

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