sensitizer
(1) a photosensitive chemical, usually potassium bichromate, aluminum bichromate, or diazonium compounds used for sensitizing photographic screen printing stencil films or emulsions; ...
Also, the gelatin acts as a sensitizer for the silver salts. In photographic films and papers, the primary purpose of the base is to support or hold the emulsion in place.
If it is considered that metallic silver is acting as a desensitizer, ... there must be some transfer of silver from the developing grains in the film, followed by a deposition of this silver on the undeveloped and unexposed grains. ...
Until the early 1900s, infrared photography was not possible because silver halide emulsions are not sensitive to infrared radiation without the addition of a dye to act as a color sensitizer[1].
-Potassium chloride - chemical used in some bleaches and sensitizers.
-Potassium citrate - chemical used in blue and green toners.
-Potassium dichromate - See Potassium bichromate.
Bichromate - refers to potassium bichromate or potassium dichromate, used for bleaching and as a sensitizer for gelatin.
 See also: Normal, Film, Back, Photograph, Emulsion
  
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