hydrofluoric

Which indubitably indicate that the bismuthous sulfide can only dissolve in halogen acid except hydrofluoric acid, the mixed solution of dilute sulfuric acid and alkali halide.

结硫化铋只能溶于氢卤（除氢氟外）、稀硫与卤化物的混合液中，不能溶于稀硫中。