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<p>[QUOTE=&quot;paddyman98, post: 2599182, member: 44615&quot;]Great question and I have an answer of something I was told of a few years ago from a fellow error coin collector and coin shop owner. (He said he knew someone at NGC)</p><p>NGC has a technique that utilizes a special machine that uses a light spectrum, maybe laser, that could inform them of any harsh chemicals that could of been used on a coin. The very first error coin that I found about 30 years ago was ruined when I tried to make it look nicer by cleaning it with Ajax. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie103" alt=":yack:" unselectable="on" unselectable="on" />... The years passed and when I sent it to NGC to get it certified it came back as Improperly Cleaned <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie20" alt=":banghead:" unselectable="on" unselectable="on" /></p><p>This is it <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" /></p><p>[ATTACH=full]567070[/ATTACH][/QUOTE]</p><p><br /></p>

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