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<p>[QUOTE=&quot;Just Carl, post: 566378, member: 4552&quot;]I missed your question about the Brown color of Lincoln Cents. Yes it is sort of a toning effect. As already noted Copper combines with numerous other substances. The most common is Oxygen to form Cu2O which is the Brownish color of Copper coins. Actually a layering of Cuprus Oxide. The worst part comes with continuous exposure to Carbon Dioxide and moisture. This starts a toning towards the greenish and/or bluish toning called Carbon Carbonate. And to further this any SO or SO2 in the air where addtional moisture may be present will further create addtional toning. </p><p>In almost every instance of toning, the metalic material in coins combines with an outside substance to form salts or crystalasations. All crystals have different colors to them based on their composition. </p><p>Additional info after this really gets boring.[/QUOTE]</p><p><br /></p>

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