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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.
Nitre, potassium nitrate KNO3, more commonly known as saltpetre, is formed in warm climates by bacterial action during the decomposition of excreta and vegetable refuse. Where people and animals live in close proximity, debris accumulates in and around their homes.