Explanatory notes
… (b) Natural magnesium carbonate (magnesite), whether or not calcined (heading 25.19); (c) Sludges from the storage tanks of petroleum oils consisting mainly of such oils … roasting to oxidise, reduce or magnetise the ore, etc. (but not roasting for purposes of sulphating, …Legal note
… (b) Natural magnesium carbonate (magnesite), whether or not calcined (heading 25.19); (c) Sludges from the storage tanks of petroleum oils consisting mainly of such oils … (heading 68.06); (f) Waste or scrap of precious metal or of metal clad with precious metal; other waste or …