In histology, potassium ferricyanide is used to detect ferrous iron in biological tissue. Potassium ferricyanide reacts with ferrous iron in acidic solution to produce the insoluble blue pigment, commonly referred to as Turnbull's blue or Prussian blue.

In histology, potassium ferricyanide is used to detect ferrous iron in biological tissue. Potassium ferricyanide reacts with ferrous iron in acidic solution to produce the insoluble blue pigment, commonly referred to as Turnbull's blue or Prussian blue.

Together with sodium ferrocyanide and calcium ferrocyanide, potassium ferrocyanide has almost no side effects when used in table salt as a food additive. ... Some people may be afraid that it is dangerous to our health due to the toxic cyanide in it and potassium cyanide will be released during cooking.

Potassium ferricyanide is also used in tempering iron and steel, sensitive coatings on blueprint paper, wood staining, dyeing wool, production of pigments, electroplating, as a laboratory reagent, and a mild oxidizing agent in organic synthesis

POTASSIUM FERRICYANIDE

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