Potassium sulfide
Is a chemical used in sulfide toning.
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Potassium sulfide - chemical used in sulfide toning.
Potassium thiocyanate - chemical used in some fine grain developers as a silver solvent.
Prehardener - chemical solution used to harden the gelatin of an emulsion prior to processing.
Kodak Poly- Toner, which contains both selenium and potassium sulfide, gives results similar to those obtained with plain selenium toner, and there seems to be no special advantage in using this toner.
 See also: Toning, Sulfide toning, Development, Silver halide, Photomicrograph
  
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