Photographic emulsion
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Photographic emulsion is a light-sensitive colloid, such as gelatin, coated onto a substrate. In silver-gelatin photography, the emulsion consists of silver halide crystals suspended in gelatin, and the substrate may be glass, plastic film, paper or fabric.
Photographic emulsion is not a true emulsion, but is a suspension of solid particles in a fluid. The word emulsion is established usage in photography and photographic science. Sensitizing solutions for non-silver gelatin processes, such as dichromated colloid processes, cyanotype and kallitype are sometimes called emulsions.
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