Thin-layer chromatography of metal ions has been performed on stannic tungstate using solvent systems containing dimethyl sulfoxide. Such binary separations as Fe-Al, La-Pr, La-Nd, Cr-Al, Tl-In, Fe-Mn, and Cr-Mn have been achieved. Gold (100 to 240 μg) has been separated quantitatively from vanadium, chromium, cerium, iron, cobalt, nickel, bismuth, manganese, titanium, and thorium in DMSO: water (1:1), and the method has been found to be precise and accurate.