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<p>[QUOTE=&quot;xlrcable, post: 1960898, member: 41288&quot;]Lots of sources give the composition of the Aztec calendar 5 and 10 centavos as copper-nickel, but before now I&#039;d never seen the exact ratio specified. So they&#039;re 80/20? It makes sense, because I often see them looking distinctly pinkish. It doesn&#039;t happen to US clad so I guess 75% copper is about the limit if you want that alloy to stay looking silver-gray.[/QUOTE]</p><p><br /></p>

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