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<p>[QUOTE=&quot;calcol, post: 4670105, member: 77639&quot;]Most chemicals used in cleaning don&#039;t leave behind detectable residue (assuming the coin is properly rinsed and dried after cleaning).&nbsp; It&#039;s the physical effects ... lines, abrasions, weird coloration, luster changes, etc. ... that are signs of cleaning.</p><p><br /></p><p>The &quot;ray gun&quot; is a x-ray fluorescence (XRF) analyzer.&nbsp; XRF analyzes the proportion of metallic elements on the surface of the coin.&nbsp; Therefore, it wouldn&#039;t detect most cleaning agents even if they were on the coin.&nbsp; What it can detect is many types of counterfeits, and metal and metallic paints used to alter coins.&nbsp; It&#039;s also useful for differentiating some patterns that were made in similar, but different, alloys.</p><p><br /></p><p>BTW, it does not make the coin radioactive.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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