Explanatory notes
… to this sub-Chapter, this heading covers the metal salts of sulphuric acid (H 2 SO 4 ) (heading 28.07), but excludes … occurs in deliquescent fused, white masses. Used instead of sulphuric acid, in particular for pickling metal, … salts) obtained by purifying kieserite, or by the action of sulphuric acid on dolomite. Colourless crystals, slightly …