in further solvent(s) soln. of SeCl4 in liquid H2S, thiohydrolysis;; formation of sulfide;;

BaCl2 in water satn. of an aq. BaCl2 soln. with H2S; further introduction of H2S and slow addition of H2SeO3 soln. with vigorous stirring; high local excess of H2SeO3 soln. should be avoided (danger of sol formation);;

in gas evaporation of Se in inert atmosphere and reaction of the vapor with S at about 700°C;;