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<p>[QUOTE=&quot;desertgem, post: 8153813, member: 15199&quot;]Black is not always the same black. A photo is very much needed as it could be a smear from a black marker pen which would be easier than if it was copper oxide or other chemical reaction residue that only specific other chemicals could remove , or nothing you could do as it would be noticed by experience collectors or graders. Welcome!</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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