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It's probably going to be cheaper, easier, and a heck of a lot less messy to just go to the drugstore and buy it, but if you're really insistent on looking for a process you could theoretically do at home, the historic method was extraction from animal feces (yes, really). Hypothetically you could make it from nitric acid and potassium hydroxide, but if you can't find a place to buy potassium nitrate your chances of getting your hands on either of those are pretty low.

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15y ago

What else can I help you with?