containing only an eighth part of a grain per ounce, it strikes an
orange-red colour, which, when the excess of gas is expelled by heat,
becomes an orange-red precipitate; and if the proportion of salt is
greater, the precipitate is thrown down at once.—The colour of the
precipitate is so peculiar as to distinguish it from every other
sulphuret; but if any doubt regarding its nature should occur, it may be
known by collecting it, dissolving it with the aid of gentle heat in
hydrochloric acid, and adding water to the solution; which will then
yield a white precipitate, the sesquioxide of antimony in union with a
little chlorine.