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<p>[QUOTE=&quot;desertgem, post: 3156814, member: 15199&quot;]The main ingredient is ferric chloride ( dissolves copper) . Anyone who made any printed circuit boards in the old days used it. WEAR GLOVES and work in ventilated areas&nbsp; and rinse coins very well before storage. Some immerse the whole coin ( say it looks better when done) others use q-tip and just work on the date ( quite visible, ugly usually).&nbsp; Be Careful,&nbsp;&nbsp; Jim[/QUOTE]</p><p><br /></p>

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