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<p>[QUOTE=&quot;Oldhoopster, post: 3992214, member: 84179&quot;]The appearance is called environmental damage.&nbsp; If you go through the steps of the minting process, there really isn&#039;t a reasonable explanation of how this could be mint induced.&nbsp; An improperly annealed planchet would show the effect on both sides. </p><p><br /></p><p>However, the 75%Cu25%Ni clad layer can show discoloration when exposed to numerous environmental conditions.&nbsp; People post these all the time.&nbsp; Exposure to moisture or some other reactant after it left the mint (including the time period before you put it into your safe) seems to be the most likely explanation[/QUOTE]</p><p><br /></p>

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