(rs) (1) (2) (3) (4) (5) 2818 artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide 1.1% 2819 chromium oxides and hydroxides 1.1% 2820 manganese oxides 1.1% 2821 iron oxides and hydroxides; earth colours containing 70% or more by weight of combined iron evaluated...