"The Arabians possessed a very considerable knowledge of the acids, in comparison with that of the Ancients, who were totally unacquainted with the mineral acids. We already find Geber teaching in his treatise De Inventione Veritatis [On the Discovery of Truth] the method of obtaining nitric acid by distilling a mixture of saltpetre, copper vitriol, and alum in certain proportions; it was designated aqua dissolutiva or aqua fortis. Its preparation from saltpetre and sulphuric acid first became known to alchemists of a later date, but we find Basil Valentine speaking of it as a process which had been in operation for a long time."
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