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<p>[QUOTE=&quot;rzage, post: 412666, member: 14070&quot;]Besides aceatone , coins are dipped in solutions with a commercial aqueous thiourea dip containing dilute sulfuric acid , leaving the coin in this kind of cleaner for more than 3 seconds can remove any surface luster , and should only be done by someone who knows what they are doing , even then many coins are made worse than are made better .</p><p>rzage:smile[/QUOTE]</p><p><br /></p>

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