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<p>[QUOTE=&quot;Kentucky, post: 1417136, member: 33176&quot;]Let me give the CocaCola thing a shot.&nbsp; Surface corrosion on copper coins is called toning when it is a surface phenomenon and is only a few atoms thick.&nbsp; When the corrosion gathers in specific areas, it becomes much thicker.&nbsp; The corrosion is caused by the reaction of copper with the environment.&nbsp; When it is thin, it can either be stabilized if it is attractive, or removed if it is unsightly.&nbsp; If it is removed, the coin will possibly or probably show traces of the removal and it is said to be &quot;cleaned&quot;.&nbsp; If the corrosion is deep, the removal will leave pits and usually a very unattractive coin.&nbsp; The CocaCola contains several acids including carbonic and phosphoric acids.&nbsp; These acids attack the corrosion and remove some or all of it, but they also attack the copper surface to some extent, possibly adding a thin layer of reaction products that could be called &quot;toning&quot; although it would probably be spotty and not at all attractive.&nbsp; I think Doug is refering to this.&nbsp; Your Coke remoived some of the surface and reacted with the cleaned copper.&nbsp; Now if you want to remove the &quot;toning&quot; from the Coke, go for it.&nbsp; Please give us photos, I would love to see what you have done.[/QUOTE]</p><p><br /></p>

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