Also known as: Salpetrae, Nitre, Sal nitrum, Nitre (Saltpeter), Saltpeter (Nitre), Saltpeter (Niter)
Potassium nitrate, a key ingredient in gunpowder and a subject of intense study in early modern chemistry and alchemy. It was often theorized as containing a 'universal spirit' or 'nitre' essential for life and combustion.
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Geber|Bacon, Roger|Richardus Anglicus|Calid|Hermes Trismegistus|Hortulanus