dye coupler

A dye coupler is a chemical compound used in color photography. In the process, a color developer oxidizes and then combines with the coupler to create a dye. This dye is deposited along with the developed silver in the image. Subsequently, the silver image is bleached, leaving behind the colored image formed by the dye. A coupler developer is specifically a photographic developer solution that includes a coupler as one of its components. These dyes are formed through chemical reactions involving conjugated double bonds, chromophores, and auxochromes, which are responsible for the absorption of light and the resulting color.123