Recent Examples of potassium nitrate from the Web
Historically, the best natural source of saltpeter, the common name for potassium nitrate, has been from caves caked with bat droppings.
The black powder used as propellant in 19th-century guns produced thick plumes of lead, carbon, sulfur, and potassium nitrate when combusted.
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Britannica.com: Encyclopedia article about potassium nitrate
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