Sodium Thio-palladate, Na₂PdS₃

On heating to redness a mixture containing equal parts of sodium hydroxide and sulphur with one-sixth of its weight of palladous sulphide or chloride and extracting the melt with water, sodium thio-palladate passes into solution, together with some sodium sulphide. Interaction with a solution of silver nitrate yields a brownish black crystalline powder consisting of Silver Thio-palladate, Ag₂PdS₃.