Explanatory notes
… The old name “sulphydrates” (hydrosulphides) is sometimes applied to the acid sulphides. Sulphides of non‑metals are … Used as a de‑hairing agent in tanning, in dyeing, as a copper absorbent in nickel refining, as a reducing agent in … forms lithopone ( heading 32.06 ). Activated with silver, copper, etc., it gives a luminophore of heading 32.06 . It …
