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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.
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