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((Short description|Chromogenic film and paper used in photography))
((refimprove|date=January 2009))

'''Dye coupler''' is present in [[Chromogen|chromogenic]] [[photographic film|film]] and [[photographic paper|paper]] used in [[photography]], primarily [[color photography]]. When a color developer [[Redox|reduces]] ionized (exposed) [[silver halide]] crystals, the developer is oxidized, and the oxidized molecules react with dye coupler molecules to form a dye ''in situ.''<ref>((Cite book|last=Rogers|first=David|url=https://books.google.com/books?id=A8mPDv1_0foC&pg=PA66|title=The Chemistry of Photography: From Classical to Digital Technologies|date=October 2007|publisher=Royal Society of Chemistry|isbn=9780854042739|page=66|language=en|oclc=1184188382|archive-url=https://web.archive.org/web/20220224095356/https://www.google.co.in/books/edition/The_Chemistry_of_Photography/A8mPDv1_0foC?hl=en&gbpv=0|archive-date=24 February 2022|url-status=live))</ref> The silver image is removed by subsequent [[bleach]] and [[Photographic fixer|fix]] processes, so the final image will consist of the dye image.

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 [[Archive|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 [[Fujifilm|Fujichrome]] [[Provia]] films) use variants of couplers that were originally designed for paper use to further improve the image permanence.

==References==
((reflist))

((photography subject))

((DEFAULTSORT:Dye Coupler))
[[Category:Photographic film types]]

((Photo-stub))

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