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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.
Salt peter is also used as a fertilizer and as a stump remover, as it accelerates the decomposition process of tree stumps. Salt peter can be found in many everyday products as well. It is used to preserve some foods, most commonly meats, although there are concerns about its health effects.