Potassium ferrocyanide is red coloured inorganic compound with formula K4[Fe(CN)6]•3H2O. Potassium ferrocyanide is nontoxic. It is finds many niche applications in industry. It is widely used for purification of tin and the separation of copper from molybdenum ores. Potassium ferrocyanide is used in the production of wine and citric acid. In the laboratory, potassium ferrocyanide is used to determine the concentration of potassium permanganate. it is used as an identifying reagent for iron in labs. Potassium ferrocyanide can be used as a fertilizer for plants.