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<p>[QUOTE=&quot;KurtS, post: 2093232, member: 11786&quot;]Strangely enough, the mint choose two metals, zinc and copper, that produce a strong galvanic reaction when there&#039;s a solution to transfer electrons. So if there&#039;s a hole in the copper plating and moisture present, copper can &#039;steal&#039; an electron from zinc, which then reacts w/oxygen to produce white zinc oxide--often used for pigments and sunblock. Since ZnO takes up more room than zinc alone, and does absorb water vapor, it pushes up the copper plating which eventually becomes a crater, speeding up the reaction further. Ironically, coins of zinc such as past wartime issues in Europe, without any copper plating...last longer.&nbsp; Correct me if any science trivia is wrong. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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