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: The most definitive non-destructive test for loose dust is to melt it into a small button or nugget, which can then be tested with a standard electronic tester or XRF machine. Expert Buying Tips

Because electronic testers cannot accurately measure loose dust or powder, you may need to use chemical or physical tests. buy gold dust online

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: Rub the dust against unglazed porcelain. Real gold leaves a golden yellow streak, while pyrite (fool's gold) leaves a black or gray mark. buy gold dust online