An Act for allowing Makers of Oxygenated Muriatic Acid to take Salt Duty-free for making such Acid or Oxymuriate of Lime for bleaching Linen and Cotton; for repealing the Excise Duties on Glauber Salt, and on Bleaching Powder imported from Ireland; and to allow a further Drawback on Foreign Brimstone used in making Oil of Vitriol.