Sulfide toning - conversion of a black metallic silver image into a brown dye image. Usually known as sepia toning.
Sulfuric acid - high corrosive chemical used in reducers.
Successful selenium or sulfide toning requires complete fixation. In other cases, the silver may be chemically bleached using a potassium hexacyanoferrate (III) solution and then re-developed in a range of toning formulations.
-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.
Sulfide toning is better still. Most surprising of all, incomplete washing of the prints, leading to trace amounts of thiosulfate in the paper, may actually improve permanence. But there are many caveats and twists and turns.
Potassium sulfide
Is a chemical used in sulfide toning.
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Indeed, I have found this to be the case, at least for selenium and sulfide toning.
 See also: Toning, Stop bath, Bleach, Stop, Blue
  
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