Photographic emulsion is a light-sensitive colloid. Most commonly, in silver-gelatin photography it consists of silver halide crystals dispersed in gelatin. The emulsion is usually coated onto a substrate of glass, films of cellulose nitrate, cellulose acetate or polyester, paper or fabric.
Photographic emulsion is not a true emulsion, but a suspension of solid particles (silver halide) in a fluid (gelatin in solution). However, the word emulsion is customarily used in a photographic context. Gelatin or gum arabic layers sensitized with bichromate used in the dichromated colloid processes cyanotype and kallitype are sometimes called emulsions.
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“The photographic image ... is a message without a code.”
—Roland Barthes (1915–1980)