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<p>[QUOTE=&quot;kden, post: 4112055, member: 110567&quot;]Not sure if you’d know this but since you’re a chemist; would xylene ruin ANY kind of coin? (Gold, copper, silver etc) because I want to clean up some various coins in my collection but want to be safe first. One is an over struck 20 cent[/QUOTE]</p><p><br /></p>

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