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<p>[QUOTE=&quot;mac266, post: 2326965, member: 26371&quot;]Rule of thumb for most collectors:&nbsp; Never clean any coin!!!</p><p><br /></p><p>In rare instances, some valuable coins can be conserved by a professional service, but one should not do it themselves.&nbsp; In 99.99999% of cases, my advice here is sound.&nbsp; Very, very experienced collectors will try the occasional dip, but for the most part, stay away from it.&nbsp; This is ESPECIALLY true with copper, because any dip will often leave an unnatural pink tone, making every collect[/QUOTE]</p><p><br /></p>

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