This is my method of making super fine metal powders for pyrotechnic use. It's a very quick method and all you need is a file, a steel plate, and a flat steel bar. Flash powder made with this fine magnesium powder is extremely powerful. By: Dornier335A
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Source: http://www.instructables.com/id/How-to-make-super-fine-powdered-magnesium-or-alumi/
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