Azochrome

“Between 1934 and 1941 Eastman Kodak developed a silver dye-bleach printing material called Azochrome. In 1941 it announced the launching of Azochrome but held back the product at the onset of World War II. After the war, the company decided to abandon its silver dye-bleach research and development and to concentrate its efforts on dye coupling and dye imbibition methods (Koshofer 1981b; Wilhelm and Brower 1993). Dye destruction is the only family of photographic processes for which Eastman Kodak never commercialized a product.”

(Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, on p. 321.)