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<p>[QUOTE=&quot;GDJMSP, post: 206558, member: 112&quot;]While acetone wil remove some contaminants from coins, it is not really the chemical most use when they &quot;dip&quot; a coin. Coin dips are commercial products that all contain an acid. When a coin is dipped the acid eats away the surface layer of a coin removing any contaminants, toning and a small amount of metal. The result is a coin that appears brand new. </p><p><br /></p><p>But a fraction of a second too long in the dip and the coin loses any luster it may have had. It becomes a dull grey color and is washed out. For all intents and purposes the coin is ruined forever.[/QUOTE]</p><p><br /></p>

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