Direct positive silver halide photographic material and method f

Details Direct positive silver halide photographic material and method f Direct positive silver halide photographic material and method f

1993-08-18

1994-11-08

Chea, Thorl

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430378, 430411, 430440, 430587, 430600, 430613, G03C 1485

Patent

active

053626214

ABSTRACT:
A direct positive silver halide photographic material and a method for forming a high contrast image using the same are disclosed, in which a pre-fogged direct positive silver halide emulsion layer contains a salt of a nitrogen-containing compound having at least one pyridine nucleus and at least one pyridinium nucleus. The photographic material, after imagewise exposure, is developed with an alkaline developer containing a developing agent, preferably a reductance compound. The photographic material provides high contrast characteristics having a gamma exceeding 10.

REFERENCES:
patent: 3945832 (1976-03-01), Shiba et al.
patent: 4273862 (1981-06-01), Yoshida et al.

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