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<p>[QUOTE=&quot;GDJMSP, post: 3056695, member: 112&quot;]The key word in your comment is &quot;can&quot;. In other words, using acetone on copper might result in that coin turning a weird color, or it might not. </p><p><br /></p><p>As has been said, I&#039;ve talking about this for years, many years, before CT even existed. And every single time I have done so I have stated quite clearly that - <u><b>sometimes</b></u> acetone can cause a copper coin to turn weird colors. I have never, ever stated that it always will.</p><p><br /></p><p>As for the possible reason being - something else on the coin - yeah, sure it&#039;s possible that&#039;s why it happens. And by the same token it is also possible that it was not something else on the coin but rather other outside variables that caused it. Ya see, the coin turning weird colors doesn&#039;t happen instantly, it happens over a period of time, maybe days or even weeks later. </p><p><br /></p><p>In any event, it doesn&#039;t really matter what causes it. The only thing that matters at all is that it sometimes happens !</p><p><br /></p><p><br /></p><p><br /></p><p>Both, I have seen it happen with my own eyes and I have read many, many reports from extremely knowledgeable collectors, professional graders, as well as many others. And I&#039;m going back 20-25 years here - and it has never changed. It can and does happen. No, not always, but sometimes.</p><p><br /></p><p>The point to be taken away here is this. If the coin is copper, and that includes all copper coin alloys, use xylene instead of acetone. Xylene will, in almost all cases do the same things, remove the same things, that acetone does. But it will not cause the coin to possibly turn some weird color. I have never seen nor heard of xylene affecting a coin in any negative way.</p><p><br /></p><p>Are there exceptions to this ? Yes, there are, there are some things that xylene will not safely remove but that acetone will. But they are few and far between. So, use xylene first, if it doesn&#039;t work, then and only use acetone. Doing it that way removes almost all of the possible risk. You have absolutely nothing to lose by following this suggestion, and possibly a lot to gain. It&#039;s just that simple.</p><p><br /></p><p>Every time this discussion comes up there are always those, (and I believe you), who say - I used on acetone on copper for many, many years and never once had a problem. And to them, anyone else saying that acetone can or might cause a problem simply cannot be true. But that is false logic. Just because you haven&#039;t seen it - doesn&#039;t mean it doesn&#039;t exist, doesn&#039;t mean that it CAN&#039;T happen. It merely means you haven&#039;t seen it happen. </p><p><br /></p><p>And no, I can&#039;t explain it chemically, I&#039;m not a chemist and don&#039;t pretend to be. I am the one who years ago went and dug up the Stonybrook report and first posted about it. I did that to show that yes there are some cases where acetone can negatively affect copper. And usually if there is one, there is more than one - even if we don&#039;t know about it yet. </p><p><br /></p><p>But the bottom line is this, it doesn&#039;t matter why it happens, or what causes it. The one and only thing that matters is that sometimes it does happen. And if you can acknowledge that, you can also easily avoid it. So why not do so ?[/QUOTE]</p><p><br /></p>

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