1868 H. B. Jones & H. WattsFownes's Man. Elem. Chem. (ed. 10) 875 The platinum salt..forms orange-yellow octohedrons, which are about as soluble as the corresponding potassio-platinic salt.
1920 Jrnl. Industr. & Engin. Chem.13 770/2 A 2 per cent solution of potassio-platinic chloride.