"Sulphuric acid was... necessary for the first stage of the Leblanc process... From the seventeenth century, Nordhausen in Saxony had been a centre for the manufacture of strong sulphuric acid by the distillation of green vitriol (ferrous sulphate), but the production there was limited and very expensive. Joshua Ward... had begun to manufacture it at Richmond in 1737 by burning a mixture of sulphur and nitre (saltpetre) in the necks of large vessels containing a little water: after several combustions, the water became converted into dilute sulphuric acid, which was then concentrated by distillation. Ward was granted a patent in 1749, even though his process was basically the same as one used experimentally by the German chemist John Glauber in the seventeenth century and his method was already being used in both France and Germany."
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Potassium nitrate
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