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Magically speaking, Saltpeter has a long, long, long history in hoodoo as an agent of magical protection in spritual baths and floor washes and as a shoe-sprinkle. Also, because it is an ingredient in Gunpowder, it is used in formulae which are hoped to produce quick (explosive) action, such as Block-Buster.
While it is difficult to find saltpeter, you can still purchase potassium nitrate, which is used to make smoke bombs and certain other fireworks, as 'stump remover'. In the United States, you can find it at Lowes or Home Depot, among other places.