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<p>[QUOTE=&quot;SPP Ottawa, post: 1612838, member: 39508&quot;]I just tested a &quot;brown&quot; 1939 Jefferson nickel with the XRF, VF grade, and it came back well over 84% copper. That is almost 10% more than mint specifications, and not a small enrichment by differential leaching of metals. I am reluctant to publish my findings until I have analyzed a lot more (to have statistical relevance). To date, I have found brown:</p><p><br /></p><p>- 1908 liberty nickel (~79% Cu)</p><p>- 1924 buffalo nickel (~82% Cu)</p><p>- 1936 buffalo nickel (~79% Cu)</p><p>- 1939 Jefferson nickel (~85% Cu</p><p>- 1940 Jefferson nickel (~82% Cu)</p><p>- 1953 Jefferson nickel (~78% Cu)</p><p><br /></p><p>On another forum, a roll hunter who has searched more than 260,000 nickels has a small hoard of those brown coins, saved only because they looked different. Hopefully, I can borrow those for analysis and to speed up the hunt...</p><p><br /></p><p>Stay tuned.[/QUOTE]</p><p><br /></p>

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