Magnesium ammonium ferrocyanide, Mg(NH₄)₂Fe(CN)₆

Magnesium ammonium ferrocyanide, Mg(NH₄)₂Fe(CN)₆, is obtained by mixing concentrated solutions of magnesium chloride and ammonium ferrocyanide in equivalent proportions. The anhydrous salt separates out as small white crystals which remain unaltered at 120° С. A saturated solution of the salt contains 2.48 grams per litre.