The most fascinating thing about potassium nitrate is its wide variety of uses. It is used in gunpowder and fireworks, toothpaste, preservatives, fire extinguishers and many more! Some of its uses were also discovered more than seven hundred years ago. With limited technology, people could make potassium nitrate by using things they found in nature; they didn't have labs like the ones we have today.
Some hazards of potassium nitrate are that it is an oxidant, causes irritation to the eyes and skin, and can be harmful if swallowed.
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