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特許 権利維持 Sulfuric acid (alternative spelling sulphuric acid) is a highly corrosive strong mineral acid with the molecular formula H2SO4. It is a pungent-ethereal, colorless to slightly yellow viscous liquid which is soluble in water at all concentrations.[5] Sometimes, it is dyed dark brown during production to alert people to its hazards.[6] The historical name of this acid is oil of vitriol.