Eastman-kodak Company

William Henry Faul

Thomas E Gompf

Patrick H Saturno

Harry David Franchino

Reversal color images are produced in silver halide photographic elements which employ a leuco dye comprising the reaction product of a color-forming coupler and an N,N-dialkyl-p-phenylenediamine stabilized against aerial oxidation by an electronegative group attached to the benzene ring. A method is disclosed which comprises developing a silver image in imagewise exposed areas of the silver halide element. The residual silver halide in unexposed areas is then fogged and developed while concurrently oxidizing the leuco dye in these unexposed areas to form a dye image which is a reversal of the imagewise exposure. Developed silver is then removed from the element to leave a dye image without oxidizing the leuco dye in the imagewise exposed areas of the element.

Method of producing reversal color images

Positive color diffusion transfer images are produced by a process that employs light-sensitive photographic elements containing dye-releasing redox agents. The dye-releasing redox agents may be a sulfonamido compound or a hydroquinone derivative which are capable of cleaving to release a diffusible color-providing moiety. A preferred process involves the use of black-and-white developer compositions and comprises

Process for producing positive color diffusion transfer images using

Color photographic elements, compositions and processes for producing color negative images are described which employ a leuco dye comprising the reaction product of a color forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring. The leuco dye is stable against aerial oxidation and can be developed to its corresponding dye with certain black and white developing compositions.

Growing community of inventors

Rochester, NY, United States of America

William Henry Faul