Photographic emulsions containing a dihydrospiropyran...

Details Photographic emulsions containing a dihydrospiropyran... Photographic emulsions containing a dihydrospiropyran...

G - Physics

03

C

96/114

G03C 1/485 (2006.01)

Patent

CA 1140792

-0- PHOTOGRAPHIC EMULSIONS AND ELEMENTS CAPABLE OF FORMING DIRECT-POSITIVE IMAGES Abstract of the Disclosure 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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