Section 06 Products of the chemical or allied industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or isotopes 28 21 Iron oxides and hydroxides; earth colours containing 70% or more by weight of combined iron evaluated as Fe2O3. 28 21 20 Earth colours Commodity Code Description 28 21 20 00 Earth colours