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<p>[QUOTE=&quot;-jeffB, post: 24878144, member: 27832&quot;]As [USER=44316]@Valentinian[/USER] said, that only works for things that contain carbon. There&#039;s a technique called <a href="https://en.wikipedia.org/wiki/Neutron_activation_analysis" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Neutron_activation_analysis" rel="nofollow">neutron activation analysis</a> that works with metals, but you need to soak your object in a nuclear reactor core, and it comes out radioactive. It&#039;s &quot;non-invasive&quot; in the sense that you don&#039;t have to drill out or scrape off a sample, but it <i>actually transmutes</i> some of the object&#039;s elements into different elements -- only in tiny trace amounts, but still, it&#039;s not <i>entirely</i> &quot;non-destructive&quot;.[/QUOTE]</p><p><br /></p>

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