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<p>[QUOTE=&quot;mikediamond, post: 46168, member: 1859&quot;]If genuine, it could be &quot;copper wash&quot; or some other form of mint discoloration.&nbsp; Problem is, nobody really understands the sources of copper staining or even thick layers of added copper that sometimes appear on nickels and clad coins.&nbsp; It&#039;s a vexing problem, but not an uncommon one.&nbsp; It&#039;s possible that prolonged immersion in a chemical rinse bath preferentially liberates copper atoms from the core and outer clad layers of clad coins (or from solid Cu-Ni coins) and then these atoms are re-deposited later as the solution becomes saturated.&nbsp; It&#039;s one guess among many and none fully explain the full range of variation seen in these errors.[/QUOTE]</p><p><br /></p>

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