saltpeter manufacturers formed the Nuniya & Labanacaste. Saltpeter finds mention in Kautilya's Arthashastra (compiled 300 BCE - 300 CE), which mentions using its poisonous smoke as a weapon of war, although its use for propulsion did not appear until medieval times.

Purification and production

A purification process for potassium nitrate was outlined in 1270 by the chemist and engineer Hasan al-Rammah

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