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Salt peter typically refers to the chemical compound potassium nitrate, though it may also refer to sodium nitrate. Salt peter was once collected from decomposing material, but today, it is generally manufactured by treating sodium nitrate, mostly mined in Chile, with potassium chloride and collecting the precipitate.
Collecting the Ingredients. 1  1. Get your hands on some saltpeter. Saltpeter is the common name for potassium nitrate. 2  2. Obtain charcoal. You can use standard charcoal that you buy to cook with your grill, which you'll need to grind to a fine powder. 3  3. Get elemental sulfur.