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<p>[QUOTE=&quot;Sundance79, post: 2825012, member: 84413&quot;]I&#039;ve been buying a lot of higher grade &#039;junk&#039; silver Walking Liberty halves over the last year or so. I look through piles of Walking Liberty halves at coin shows and pull out those that would grade at VF or higher. I noticed that a many seem to have dark marks and dark streaks on them. This weekend while I was looking at one I couldn&#039;t help but rub my finger across a dark patch, and I noticed that about half of the dark patch disappeared. One or two more light rubs and it was gone.</p><p><br /></p><p>While I come from the never, never, never clean coins. I was wondering about perhaps putting some of these in acetone to see if that would safely remove what appears to be an oily grim on the coins. It all it is is an oil base material, then the acetone should safely remove the grim and not affect the coin surface at all.&nbsp; Right?</p><p><br /></p><p>Any thoughts??[/QUOTE]</p><p><br /></p>

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