| Silicon Monosulphide, SiS, is formed, together with the oxysulphide, SiOS, when sulphur vapour is passed over silicon heated to whiteness in a porcelain tube, and also when ferrosilicon and sulphur are heated together in an electric furnace. Silicon monosulphide is a yellow volatile solid, which also appears to exist in a black modification, and dissolves in alkali solution with evolution of hydrogen. |