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<p>[QUOTE=&quot;Insider, post: 5252814, member: 24314&quot;]mrbadexample, asked: &quot;Green and black residues don&#039;t come right off my copper coins. What&#039;s your secret? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie81" alt=":shifty:" unselectable="on" unselectable="on" /></p><p><br /></p><p>This &quot;snarky&quot; post of yours is actually a very sensible question.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />Unfortunately, what you ask is the product of years of experimentation that allowed me to help start the Numismatic Conservation Service at NGC.&nbsp; While what you ask in proprietary, I have instructed several coin dealers the &quot;art&quot; of conserving coins but the class is expensive.</p><p><br /></p><p>What I can tell you is that IMO, copper is the hardest metal to fool with.&nbsp; Some types of contamination are virtually impossible to remove w/o leaving a trace.&nbsp; Other things like those on the OP&#039;s coin can be removed.</p><p><br /></p><p>BTW, one unconfirmed rumor I&#039;ve heard is some folks are employing lasers to remove spots.[/QUOTE]</p><p><br /></p>

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