Photographic emulsions and elements capable of forming direct-po

Details Photographic emulsions and elements capable of forming direct-po Photographic emulsions and elements capable of forming direct-po

1980-11-17

1981-12-15

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430589, 430598, G03C 524

Patent

active

043060170

ABSTRACT:
Silver halide emulsions are disclosed containing silver halide grains capable of forming an internal latent image. Incorporated in the emulsions as a nucleating agent is a dihydrospiropyran bis-condensation product of salicylic aldehyde and at least one heterocyclic ammonium salt, thereby permitting a direct-positive image to be formed on imagewise exposure and photographic processing.

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Samat et al., "Bicondensation Adducts of Salicylic Aldehydes on Benzoheterocycloammonium Salts. Potential Applications to Thermographic Recording Process", Journal of Photo. Sci., 26, 1978, pp. 34-43.

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