Sodium ferrithiocyanate, Na₃Fe(CNS)₆

Sodium ferrithiocyanate, Na₃Fe(CNS)₆.12H₂O, is formed by allowing a mixed solution of sodium and ferric thiocyanates to crystallise over sulphuric acid. It crystallises in dark green hexagonal or rhombic crystals. These dissolve in water to a deep red solution, and are partially decomposed. In alcohol a violet solution is obtained, from which the salt may be recrystallised unchanged.