… colours containing 70 % or more by weight of combined iron evaluated as Fe2O3. …
Explanatory notes
… colours containing 70 % or more by weight of combined iron evaluated as Fe 2 O 3 . 2821.10 ‑ Iron oxides and hydroxides … oxides, containing 70 % or more by weight of combined iron calculated as Fe 2 O 3 , fall in this heading. For the … has been reached, account must be taken of the total iron content expressed as ferric oxide; thus a natural ferrous …