Lead Platinocyanide, PbPt(CN)₄

Lead Platinocyanide, PbPt(CN)₄, is readily prepared by mixing boiling saturated solutions of potassium platinocyanide and lead acetate. The solution remains clear, but on cooling the lead salt separates out as a yellowish white crystalline powder. It is anhydrous, and becomes yellow on warming in air, then white; whilst at higher temperatures cyanogen is liberated, the residue containing metallic lead and platinum.