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<p>[QUOTE=&quot;desertgem, post: 4143286, member: 15199&quot;]I suspect it is reflective light from some sharp abrasions that formed shear surfaces ( tiny sharp flat)I do not think it is chemical residue or such. Collectors many decades&nbsp; ago would &quot;thumb&quot; the coin, trying to minimize the sharpness by rubbing them. If is it a residue , that&#039;s the best chance to solve it as rubbing it will show IMO, Jim[/QUOTE]</p><p><br /></p>

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