Whitening agents in color diffusion transfer film units

Details Whitening agents in color diffusion transfer film units Whitening agents in color diffusion transfer film units

1974-12-26

1976-12-07

Klein, David

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 29D, 96 73, 96 74, 96 77, 96 84R, G03C 700, G03C 140, G03C 184, G03C 554

Patent

active

039960501

ABSTRACT:
This invention relates to photographic film structures for forming color transfer images viewable by reflected light without separation of the photosensitive and image-receiving components and to diffusion transfer processes employing these unitary film units wherein a dye is initially positioned in the image-receiving component to offset the color stain that tends to form in the highlights of the transfer image during aging. Any dye or mixture of dyes may be employed which are capable of absorbing visible light in a wavelength range complementary to the wavelength range absorbed by the color stain and are used in a concentration such that the highlights, i.e., D.sub.min areas of the transfer image, appear substantially white after aging, as observed by the eye. In a preferred embodiment, the dye employed is a dye developer.

REFERENCES:
patent: 3269840 (1966-08-01), Pattyn et al.
patent: 3592645 (1971-07-01), Weyerts et al.
patent: 3743531 (1973-07-01), Ducharme
patent: 3802881 (1974-04-01), Land et al.

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