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Ask The Experts - What are these thin brittle sheets with reddish powder?
August 2018 by Chris Ralph
The Portable XRF Gun
While there is no metal detector that will see only gold, there is a device that can reliably distinguish gold from lead, copper, iron or other metals. It is an X-Ray fluorescence tester, sometimes called an XRF gun.
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Ask The Experts - Need assaying advice
Ask The Experts - Where did the gold go?
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