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.
Read more about Photographic Emulsion: Components, Manufacture
Famous quotes containing the word photographic:
“... the most grandiose result of the photographic enterprise is to give us the sense that we can hold the whole world in our heads—as an anthology of images.”
—Susan Sontag (b. 1933)