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<p>[QUOTE=&quot;rzage, post: 413422, member: 14070&quot;]I was practicing with MS-70 on some nickles and pennies , after using it on both for about 15 seconds a side I rinsed them with warm tap water then with distilled water , after letting them dry I put them on the side with the penny on top of the nickle , later I noticed the nickle turned a copper color where the two coins touched . This is definately not a benign substance , a substance I would consider quite harsh . If you use it , practice on many junk coins 1st .</p><p>rzage:smile:hatch::hammer:[/QUOTE]</p><p><br /></p>

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