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<p>[QUOTE=&quot;Publius2, post: 8105680, member: 105571&quot;]The &quot;nickel&quot; 3-cent piece is only 25% nickel.&nbsp; The remaining 75% is copper.&nbsp; So, your green spot is a form of copper corrosion and you may want to address it before it spreads.&nbsp; There are a number of remedies to slow or stop it.&nbsp; There are innumerable threads on this site on the topic with recommendations.&nbsp; In addition to this forum, search the &quot;Coin Chat&quot; forum.[/QUOTE]</p><p><br /></p>

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