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<p>[QUOTE=&quot;-jeffB, post: 2789496, member: 27832&quot;]No, nickels have uniform composition throughout. In fact, it&#039;s exactly the same compound that forms the outer clad layers of dimes, quarters, and halves -- just no copper core in nickels.</p><p><br /></p><p>I&#039;ve seen that &quot;copper-colored nickel&quot; effect on many coins, including some dateless Buffaloes that I left in the vinegar too long. Nickel&#039;s more chemically active than copper, and I think many corrosion processes leach it out preferentially, leaving the copper behind.[/QUOTE]</p><p><br /></p>

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