Abstract: A process is disclosed of forming a reversal dye image. This is accomplished by developing an imagewise exposed photographic element with a black-and-white developer and poisoning the developed silver as a redox amplification catalyst for a peroxide oxidizing agent. The undeveloped silver is then rendered developable to form a silver catalyst image pattern. This latter silver image pattern is then used to catalyze the redox reaction of a peroxide oxidizing agent and a dye-image-generating reducing agent, such as a color-developing agent, or a redox dye-releaser.

Abstract: My invention is directed to a process of forming dye images. I accomplish this through a first redox amplification reaction in which a cobalt (III) complex oxidizing agent enters into a redox reaction with a reducing agent at the site of a catalyst image. A second redox amplification reaction follows in which a peroxide oxidizing agent is employed along with dye-image-generating reducing agent to form a dye image corresponding to the pattern of the catalyst.

Abstract: A process is disclosed of forming a reversal dye image. This is accomplished by developing an imagewise exposed photographic element with a black-and-white developer and poisoning the developed silver as a redox amplification catalyst for a peroxide oxodizing agent. The undeveloped silver is then rendered developable to form a silver catalyst image pattern. This latter silver image pattern is then used to catalyze the redox reaction of a peroxide oxidizing agent and a dye-image-generating reducing agent, such as a color-developing agent, or a redox dye-releaser.

Abstract: My invention is directed to a process of forming dye images. I accomplish this by bleaching a silver image at least in part with a cobalt bleaching agent to form within the silver image pattern an immobile cobalt reaction product. The concurrent presence of the immobile cobalt reaction product, a peroxide oxidizing agent and a dye-image-generating reducing agent within the silver image pattern allows a dye image to be formed which corresponds to the silver image pattern.