Calcium ammonium ferrocyanide, (NH₄)₂CaFe(CN)₆

Calcium ammonium ferrocyanide, (NH₄)₂CaFe(CN)₆, results on mixing cold concentrated solutions of calcium chloride and ammonium ferrocyanide, in equimolecular proportions, washing the precipitate and drying in air or at 100° C. It also results on boiling potassium calcium ferrocyanide with water containing a large excess of ammonium chloride.

One part of the salt dissolves in 388 parts of water at 15° to 17° C.