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<p>[QUOTE=&quot;mikediamond, post: 136940, member: 1859&quot;]Invasive tests are not for everyone.&nbsp; But I&#039;ve found them useful over the years to detect anomalous compositions and reject claims of nonstandard compositions.&nbsp; It&#039;s quicker, and a lot cheaper, than an SEM/X-ray test.&nbsp; But I always weigh the coin first, measure its diameter, test its ring, and perform a specific gravity test.&nbsp; That usually obviates the need for an invasive test.</p><p><br /></p><p>Years ago I bought a BU cent allegedly struck on a brass planchet.&nbsp; It sure looked like brass.&nbsp; The weight and diameter were normal.&nbsp; I scraped the edge against a fine sharpening stone and revealed a normal copper color dramatically different from the surface color.&nbsp; I sent the coin back and got my money back.[/QUOTE]</p><p><br /></p>

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