Dye mordanting development
AssigneeE. I. Du Pont de Nemours and Company
InventorFrank L. Schadt, III
Life of this patent
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Abstract
A gelatino-silver halide film is exposed and then developed with a tanning developer bearing a positively or negatively charged substituent, e.g., a quaternary amine-substituted hydroquinone, to produce a charged matrix in the gelatin. To enhance the image the film is then processed to mordant an oppositely charged species, e.g., an anionic dye, to the charged matrix.
Claims8
A process in which a photographic film comprising a support bearing a photosensitive gelatino-silver halide emulsion is imagewise exposed and thereafter developed with a tanning developer bearing a positively or negatively charged substituent to produce a charged matrix in the gelatin, characterized in that the developed film is then processed to mordant an oppositely charged species to the charged matrix.
A process for supplementing a silver image formed by exposure and development of a photosensitive gelatino-silver halide emulsion film comprising the steps of:
- (1) exposing the film imagewise,
- (2) developing the film in a developer solution containing a tanning developer bearing a positive or negative charge to produce a positive or negative charge in the gelatin matrix, and
- (3) processing the developed film in a solution containing an oppositely charged species which mordants to the charged matrix,
- whereby the developed silver image and mordanted matrix function in combination to produce a useful image.
A process wherein a gelatino-silver halide emulsion coated on a support is imagewise exposed, and the exposed emulsion is developed in a developer comprising a quaternary amine-substituted hydroquinone, which generates positive charges imagewise in the gelatin matrix of the emulsion via tanning development, and an anionic dye is thereafter mordanted to the charged areas in imagewise correspondence with the silver.
Dependencies are inferred from the claim text.