Cobaltous Cobalto-cyanide, Co₂Co(CN)₆

Cobaltous Cobalto-cyanide, Co₂Co(CN)₆, is obtained as a red precipitate on adding cobalt sulphate to a solution of potassium cobalto-cyanide. It dissolves in excess of the potassium salt, yielding Cobalt Potassium Cobalto-cyanide, K₂CoCo(CN)₆.