SECTION VI - PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES > CHAPTER 28 - INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METALS, OF RARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES > IV. INORGANIC BASES AND OXIDES, HYDROXIDES AND PEROXIDES OF METALS > 2821 Iron oxides and hydroxides; earth colours containing 70 % or more by weight of combined iron evaluated as Fe2O3 > Iron oxides and hydroxides