Potassium ferricyanide

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Ruby red crystalline powder that is used to make blueprints, to stain Wood, and dye Wool. Potassium ferricyanide is also used as an etching liquid in electroplating and as a Reducing agent for photography.

Chemical structure

Potassium ferricyanide.jpg

Synonyms and Related Terms

farmer's reducer; potassium hexacyanoferrate (III); Mercer's liquor; red prussiate of potash; red potassium prussiate;


  • Decomposes with heat, acids or UV light to produce highly toxic hydrogen cyanide fumes.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water. Slightly soluble in ethanol.

Composition K3Fe(CN)6
CAS 13746-66-2
Density 1.85 g/ml
Molecular Weight mol. wt. = 329.25

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 632
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Photographic chemicals at www.jetcity.com/~mrjones/chemdesc
  • N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology, Archetype Publications, London, 2000, p. 62.