Photographic Emulsion

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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Photographic Emulsion - Manufacture
... The type and quantity of gelatin used influences the final emulsion's properties ... metal dopants, ripener, ripening restrainer, surfactants, defoamer, emulsion stabilizer and biocide are also used in emulsion making ... Most modern emulsions are "washed" to remove some of the reaction byproducts (potassium nitrate and excess salts) ...

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