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<p>[QUOTE=&quot;JMGallego, post: 2665114, member: 35622&quot;]Yes, the so-called &quot;sniffer&quot; (can be an analytical instrument called Surface Enhanced Raman Scattering, SERS <a href="http://jes.ecsdl.org/content/129/8/1716.short" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://jes.ecsdl.org/content/129/8/1716.short" rel="nofollow">http://jes.ecsdl.org/content/129/8/1716.short</a> or even by&nbsp; Infrared reflectance spectra, <a href="http://www.sciencedirect.com/science/article/pii/S0010938X70800269" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.sciencedirect.com/science/article/pii/S0010938X70800269" rel="nofollow">http://www.sciencedirect.com/science/article/pii/S0010938X70800269</a> ) will detect films of benzotriazole (BTA) on the surface of a copper coin or in a coin that contains copper (such a 90% silver coins).&nbsp; BTA does not &quot;disappear&quot;, it creates CuBTA by covalent bonding with the copper atoms.[/QUOTE]</p><p><br /></p>

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