Explanatory notes
… This heading covers artificial magnesium sulphate (MgSO 4 .7H 2 O) (Epsom salts, Seidlitz salts) obtained by purifying … is excluded ( heading 26.03 ). (7) Zinc sulphate (ZnSO 4 .7H 2 O). Obtained by the action of dilute sulphuric acid on … production of copper or zinc. (10) Cobalt sulphate (CoSO 4 .7H 2 O). Prepared from cobaltous oxide and sulphuric acid; …
