Strontium cupriferrocyanide, SrCuFe(CN)₆

Strontium cupriferrocyanide, SrCuFe(CN)₆, is obtained in a similar manner to the calcium salt, which it closely resembles.

When a copper sulphate solution is added to excess potassium ferrocyanide, a mixture of di-potassium cupric and di-potassium tricupric ferrocyanides is produced, namely K₂CuFe(CN)₆ and K₂Cu₃[Fe(CN)₆]₂ respectively.

If cuprous chloride is substituted for cupric sulphate, then different cuprous potassium ferrocyanides are obtained according to circumstances, namely K₂Cu^•₂[Fe(CN)₆]; KCu^•Cu^••₃[Fe(CN)₆]₂; and KCu^•₃[Fe(CN)₆]. The last of these is obtained, when cuprous chloride is in great excess, as a white precipitate.