Topic summary
Dye couplers
Extracted from the Wikipedia article Dye coupler.
Dye coupler technology has seen considerable advancement since the beginning of modern color photography. Major film and paper manufacturers have continually improved the stability of the image dye by improving couplers, particularly since the 1980s, so that archival properties of images are enhanced in newer color papers and films. Generally speaking, dye couplers for paper use are given more emphasis on the image permanence than those for film use, but some modern films (such as FujichromeProvia films) use variants of couplers that were originally designed for paper use to further improve the image permanence.