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<p>[QUOTE=&quot;GDJMSP, post: 5309315, member: 112&quot;]Well, here&#039;s the thing Jeff. It doesn&#039;t matter what causes the coins to sometime change color when they are rinsed in acetone. It only matters they do sometimes change color.</p><p><br /></p><p>In that regard it&#039;s kinda like contact marks on a coin. It doesn&#039;t matter what caused the contact marks, it only matters that they are there ! </p><p><br /></p><p>My point is, maybe it is that there is/was something on the surface of the coin that reacted with the acetone and caused the color change. But when you can&#039;t see anything on the coin, and there is no way to find out if there is anything on the coin, then you have no way of ever knowing if it will change color or not once you rinse the coin in acetone. And if it does then it&#039;s too late.</p><p><br /></p><p>What I have also posted many, many times on this subject is that there is a very easy solution to avoiding the risk - don&#039;t use acetone, use xylene instead because it does not cause color changes on copper.[/QUOTE]</p><p><br /></p>

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