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<p>[QUOTE=&quot;Saro, post: 2234895, member: 75772&quot;]I have a few questions about patina, or toning on coins.</p><p><br /></p><p>I have recently got my hands on some BU Cupronickel coins, and was wondering (they are slabbed but not air-tight) how they might develop? I could obviously wait a few years, but I&#039;m still quite curious (I can always post a before/after if anyone is interested).</p><p><br /></p><p>Same question for copper coins. I&#039;ve noticed, some Lincoln pennies from the 1960&#039;s (where it was 95% copper rather than today&#039;s plated zinc) seem to go two ways: either chocolate coloured, or dark red, sometimes with verdigris. What determines which colour it goes? Specific chemicals, or is it just random?[/QUOTE]</p><p><br /></p>

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