Prepd by the action of hydrogen selenide on a soln of potassium antimonyl tartrate: Moser, Atynsky, Monatsh. Chem. 45, 235 (1924); Berzelius cited in Mellor's Vol. 10, 793 (1930); by direct union of the elements: Chretien, Compt. Rend. 142, 1339, 1412 (1906); Parravano, Gazz. Chim. Ital. 43, I, 210 (1913); Berzelius, loc. cit. See also: Chikashige, Fujita, Mem. Coll. Sci. Kyoto Imp. Univ. 2, 233 (1917).