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<p>[QUOTE=&quot;GDJMSP, post: 761478, member: 112&quot;]As is almost always true, there are exceptions to every rule. Yes, we most definitely tell everyone that cleaning their coins is a bad idea. </p><p><br /></p><p>However, what if a coin has PVC contamination ? Well in that case we tell them that they absolutely need to clean the coin - the PVC contamination has to come off to prevent additional damage being done to the coin.</p><p><br /></p><p>Well it&#039;s the same thing with toning. If toning has advanced to the point that it has turned black, then that toning needs to be removed or damage will be done to the coins. For black toning is no longer toning - it is corrosion happening right in front of your eyes.</p><p><br /></p><p>That said, one needs to be careful and to be certain that the toning has advanced to that point before attemtping to remove it. And then the removal needs to be done by someone who knows what they are doing or even more serious damage will be done to the coin by the removal of the black toning.</p><p><br /></p><p>There really is only 1 way to remove it - a commercial coin dip - an acid. </p><p><br /></p><p>So, cris - Welcome to the Forum ! And if you can please post some pics of the coins in question so that we can offer you the best advice. We need to see if the toning is indeed black, or just dark.[/QUOTE]</p><p><br /></p>

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