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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.
Pickling salt is a fine-grain salt with a uniform structure from granule to granule. It contains no iodine or anti-caking additives. Though it is processed, it is pure salt. It is generally used in pickling and canning foods but can also be used for baking.