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<p>[QUOTE=&quot;Lehigh96, post: 2760790, member: 15309&quot;]After reading this thread, I&#039;m inclined to think that they are grease as pointed out by both Mark Feld and the Heritage cataloger.&nbsp; And while I have seen these marks before, I don&#039;t think they are near as common as Doug is making them out to be, which is the crux of his argument for why they are caused by coin to coin contact.&nbsp; I also don&#039;t believe that people will always attempt to remove these types of marks by bathing them in acetone.&nbsp; Meaning, if they are grease, and can be removed by acetone, maybe that process wasn&#039;t applied to that coin.</p><p><br /></p><p>The theory that it is a lighting trick doesn&#039;t hold water, these black marks are clearly on the coins and are not a visual illusion.</p><p><br /></p><p>The one think that nobody seems to be considering is that perhaps these types of marks are caused by more than one process which would explain why sometimes they are removable an other times they are not.[/QUOTE]</p><p><br /></p>

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