| 摘要 |
PHOTOGRAPHIC PRODUCTS AND PROCESSES 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 lightabsorbing, pH-sensitive optical filter agent for the longer wavelength region of the visible spectrum.
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