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<p>[QUOTE=&quot;GDJMSP, post: 7879782, member: 112&quot;]I would add something here. In the group of pics posted by USS656 in his initial post, that 1st pic, the one on the far left - </p><p><br /></p><p><img src="https://www.cointalk.com/attachments/upload_2021-9-7_21-8-1-png.1357451/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>- just because you see dark and or black coloration on a coin, that does not mean it&#039;s PVC residue. It very well could be, and often is nothing more than advanced toning because advanced toning often is of the very same color. </p><p><br /></p><p>The key to recognizing that it is or might be old PVC residue is the blotchy, splotchy, nature of the black coloration. Toning almost never occurs like that ! Or, you may be able to see a bit of flaky looking stuff here and there. Dried out PVC residue has that look sometimes. But toning never does.</p><p><br /></p><p>And the easy test to find out if it is PVC residue is to do exactly what Daryll did, soak the coin in acetone or xylene for a while. And if it is PVC residue doing that will remove some of it, just like in the pics you can see that Daryll posted. And you don&#039;t have to worry about doing this because, when used correctly, neither acetone nor xylene can ever harm the coin in any way.</p><p><br /></p><p>That said, if using the acetone or xylene does not remove any of the black coloration, then what you&#039;re looking at is not PVC residue - it is toning. And you can know this because neither acetone nor xylene can ever remove toning.</p><p><br /></p><p>It should also be noted that when it is dark like what you see on that coin, a quick rinse in acetone or xylene probably isn&#039;t going to do anything. It is going to require soaking the coin for at least 24 hrs, and maybe longer, before you can see noticeable results. And as Daryll explained, sometimes the acetone or xylene just isn&#039;t enough to get it all off and you will have to take the same additional steps that Daryll did to remove all of it.[/QUOTE]</p><p><br /></p>

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