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<p>[QUOTE=&quot;leaconcen, post: 1389655, member: 31684&quot;]I have run into some medals with the coating not frequently but sometimes.&nbsp; Most times, I have found the patina on more recent medals.&nbsp; I also collect coins especially those connected with a historical events such as the centennial etc.&nbsp; Thanks for the warning though.&nbsp; I usually use acetone, but sometimes I find copper medals/coins that need dipping.&nbsp; These I need a different method be it alcohol or the xylene substitute Pro Par.[/QUOTE]</p><p><br /></p>

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