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<p>[QUOTE=&quot;desertgem, post: 653354, member: 15199&quot;]I suspect you are seeing the remains of an old &quot;vinegar&quot; treatment of some sort, leaving copper acetate deposits. I have not seen that type of corrosion on a coin not chemically treated. I think Verdigone would be the best bet by far, IMO, but I would personally rinse it in acetone properly ( put into a glass container for a few minutes with pure acetone, take out the coin and hold vertically and pore fresh acetone across surfaces into the glass container, allow coin to dry and put into a mylar or hard plastic holder) until you decide what to do. </p><p><br /></p><p>From the photo, the question is whether the darker spots around the blue represents damage or &quot;carbon spotting&quot; which verdigone can&#039;t help. You won&#039;t know until it is treated. There will also probably be disruption of the &quot;wood grain&quot; effect, but I don&#039;t think these would affect the coins value any more than it is, and it would look better in my opinion.</p><p><br /></p><p>This is in my opinion and as such is the best I can offer, but may be wrong. Your mileage may vary.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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