Explanatory notes
… defined inorganic colouring matters (e.g., basic lead carbonate; oxides of iron, lead, chromium or zinc; sulphides … treating mixtures of various silicates, aluminates, sodium carbonate, sulphur, etc. Green, pink and violet ultramarines … example : (a) Kaolin ( heading 25.07 ). (b) Calcium carbonate ( heading 25.09 or 28.36 ). (c) Barium …