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<p>[QUOTE=&quot;physics-fan3.14, post: 26320595, member: 19165&quot;]You either take them at their word, or you get it tested. There are numerous surfaces tests (chemical and radiological, such as XRF). </p><p><br /></p><p>For the really large bars, they actually drill into it and take a core sample to make sure it isn&#039;t tungsten or something else plated with silver.[/QUOTE]</p><p><br /></p>

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