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<p>[QUOTE=&quot;-jeffB, post: 2753499, member: 27832&quot;]But such coins aren&#039;t <i>missing the nickel</i>, they&#039;re <i>missing the clad layer</i> -- which is a layer of alloy that&#039;s 25% nickel, 75% copper. Yes, they only lose a bit less than a quarter-gram of <i>nickel</i>, but they lose almost a full gram of <i>weight</i>.</p><p><br /></p><p>By contrast, if some environmental process leached away the nickel while leaving the copper intact, it couldn&#039;t reduce the weight by more than a quarter-gram per side -- assuming it <i>could</i> leave the copper intact, which is actually pretty unlikely.[/QUOTE]</p><p><br /></p>

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