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<p>[QUOTE=&quot;SPP Ottawa, post: 1538515, member: 39508&quot;]In 1982, composition of the Canadian 5-cent coins changed from 100% nickel to 75% copper and 25% nickel (same as US nickels). So, they tone and darken differently. That said, there are other types of &quot;brown nickels&quot; from 1982 to 1992, which are copper-rich alloys. I tested a bunch on the XRF in my lab, and published a paper in June 2012 on this very topic.</p><p><br /></p><p>I would gladly test your coin for free...[/QUOTE]</p><p><br /></p>

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