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<p>[QUOTE=&quot;-jeffB, post: 2879791, member: 27832&quot;]No, that&#039;s not what I meant to say.</p><p><br /></p><p>The coin is struck from a &quot;sandwich&quot; with pure copper in the middle layer and cupronickel (75% copper, 25% nickel) in the outer layers. If you look at a <i>new</i> quarter, you&#039;ll see a reddish or orange stripe around the rim; that&#039;s the copper layer.</p><p><br /></p><p>This quarter spent some time in a corrosive environment. The pure copper dissolved faster than the cupronickel. So, at the coin&#039;s rim, the copper middle layer got etched more deeply, leaving the cupronickel sticking out.</p><p><br /></p><p>Does that make sense? It&#039;s kind of surprising to see it the first time, but we&#039;ve seen it before...[/QUOTE]</p><p><br /></p>

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