Explanatory notes
… 99.5 % pure. Sublimed sulphur , or flowers of sulphur , is obtained by slow distillation of crude or impure sulphur, … The precipitated sulphur classified here is always obtained by precipitating a solution of a sulphide, or of an … heading 25.03 . (B) COLLOIDAL SULPHUR Colloidal sulphur is obtained by the action of hydrogen sulphide on a solution of …