Explanatory notes
… include, e.g., in aluminium metallurgy, as a filler for paints, in the manufacture of abrasives and synthetic … or semi‑precious stones (rubies, sapphires, emeralds, amethysts, aquamarines, etc.), as a dehydrating agent (for … the manufacture of ceramic glazes, printing inks, medicinal products, alums, the artificial corundum described above and …