Dye coupler is present in
chromogenic film and
paper
Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, Textile, rags, poaceae, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre e ...
used in
photography
Photography is the visual art, art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It i ...
, primarily
color photography. When a color developer
reduces ionized (exposed)
silver halide
A silver halide (or silver salt) is one of the chemical compounds that can form between the Chemical element, element silver (Ag) and one of the halogens. In particular, bromine (Br), chlorine (Cl), iodine (I) and fluorine (F) may each combine wi ...
crystals, the developer is oxidized, and the oxidized molecules react with dye coupler molecules to form a dye ''in situ.''
The silver image is removed by subsequent
bleach and
fix
Fix or FIX may refer to:
People with the name
* Fix (surname)
Arts, entertainment, and media Films
* ''Fix'' (film), a feature film by Tao Ruspoli Music
* ''Fix'' (album), 2015 album by Chris Lane
* "Fix" (Blackstreet song), 1997 song by Black ...
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
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
Fujichrome
, trading as Fujifilm, or simply Fuji, is a Japanese multinational conglomerate headquartered in Tokyo, Japan, operating in the realms of photography, optics, office and medical electronics, biotechnology, and chemicals.
The offerings from th ...
Provia
Provia is a brandname for a pair of daylight-balanced color reversal films (slide film) produced by the Japanese film company Fujifilm. It is currently available in one speed, 100/21°, marketed as Fujichrome Provia 100F Professional DP III'', ...
films) use variants of couplers that were originally designed for paper use to further improve the image permanence.
References
Photographic film types
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