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• 10:19, 16 March 2025 Parijat talk contribs deleted page The Alchemy of Air (Book) (content was: " ==== On gunpowder ==== * Because every barrel of gunpowder required three-quarters of a barrel of saltpeter, access to saltpeter became a matter of national survival. * In 1626 England’s King Charles I commanded his subjects to “carefully and constantly keep and preserve in some convenient vessels or receptacles fit for the purpose, all the urine of man during the whole...", and the only contributor was "Parijat" (talk))