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<p>[QUOTE=&quot;johnmilton, post: 5219324, member: 101855&quot;]Most collector know that the most common copper coin corrosion is green. Sometimes it can be a dark red, or sometimes black. </p><p><br /></p><p>Copper-nickel coins, like the Flying Eagle Cents, &quot;thick white&quot; Indian Cent from 1859 to 1864, Nickel Three Cent Pieces and the five cent nickel usually turn black when they corrode. You can can get a little green here and there, but black is the standard color. </p><p><br /></p><p>If you are looking to buy copper-nickel coins, the black color is not is good. The&nbsp; coins can&#039;t be fixed because the surfaces are made of the corroded metal. It is best to avoid them.[/QUOTE]</p><p><br /></p>

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