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Production of Saltpetre (Nitre, Potassium Nitrate, or Kn0), 1683
24" x 24"

Production of saltpetre nitre potassium nitrate or KN Nitre beds heaps of manure mixed with chalky earth These were watered with urine and manure water Calcium nitrate crystallised on the surface and was scraped off and taken to shed for processing Saltpetre is the principal ingredient in gunpowder and is still used in the preservation of some foods In medicine it was used internally as a diuretic but now is only used externally for a number of conditions such as asthma From a English edition of Beschreibung allerfurnemisten mineralischen Ertzt by Lazarus Ercker Prague