Photographic products and processes

Details Photographic products and processes Photographic products and processes

C - Chemistry, Metallurgy

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96/33, 260/357.6

C07D 311/92 (2006.01) C07D 311/80 (2006.01) C09B 11/08 (2006.01) C09B 11/26 (2006.01) G03C 1/40 (2006.01) G03C 8/48 (2006.01)

Patent

CA 1325639

PHOTOGRAPHIC PRODUCTS AND PROCESSES Abstract of the Disclosure This invention relates to diffusion transfer photographic processes adapted to be performed in the presence of ambient light and to diffusion transfer products useful in such processes wherein a substantial increase in opacification in the red and near infrared region of the visible spectrum and a substantial increase in opacification in the blue and green region is achieved by employing certain alkyl-substituted phenanthrol/carboxynaphthol phthaleins as the light- absorbing, pH-sensitive optical filter agent for the longer wavelength region of the visible spectrum.

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