Direct positive silver halide photographic materials

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

1976-06-28

1978-06-13

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Ionizing electrode details

96 64, 96107, G03C 524, G03C 106, G03C 128

Patent

active

040946835

ABSTRACT:
A direct positive silver halide light-sensitive material capable of forming direct positive images comprising a support having coated thereon at least one internal image type silver halide emulsion layer, wherein at least one hydrophilic colloid layer contains a heterocyclic quaternary salt compound represented by formula (I) in an amount necessary to provide the silver halide photographic emulsion with a fogging function. ##STR1## wherein Z is an atomic group necessary for completing a 5- or 6-membered heterocyclic nucleus, R.sub.1 is an aliphatic group, R.sub.2 is a hydrazonoalkyl group, X.crclbar. is an anion, and n is 1 or 2.

REFERENCES:
patent: 3384484 (1968-05-01), Schranz et al.
patent: 3525622 (1970-08-01), Willems et al.
patent: 3615615 (1971-10-01), Lincoln et al.
patent: 3718470 (1973-02-01), Spence et al.

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