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<p>[QUOTE=&quot;-jeffB, post: 2810371, member: 27832&quot;]There are some corrosive agents that will dissolve the nickel out of the copper-nickel alloy, leaving copper behind. I haven&#039;t ever seen one where the boundaries are this distinct and the coppery parts so bright, but I can imagine producing one.</p><p><br /></p><p>There&#039;s no such thing as a &quot;copper-core&quot; US nickel. They&#039;re uniform 25% nickel - 75% copper alloy, all the way through -- unless, like yours, they&#039;re chemically attacked.</p><p><br /></p><p>Welcome to CoinTalk![/QUOTE]</p><p><br /></p>

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