Explanatory notes
… used in pyrotechnics. (ii) Orpiment, which is an arsenic trisulphide, bright yellow, used in paint‑making. Mispickel … of all kinds ( heading 25.05 ). (7) Pozzolana, santorin, trass and similar earths, sometimes called natural cements … ). (11) Opacifiers used in enamelling, obtained by the treatment (purification with hydrochloric acid and …