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<p>[QUOTE=&quot;DieHard11, post: 2234934, member: 74563&quot;]<i><font size="4">The brown (and sometimes blackish) toning is caused by cupric oxide (cuprous oxide), while the verdigris is from exposure to copper sulfate and a green/blue by copper carbonate.&nbsp; How a coin is stored (e.g., cardboard flips, folders, etc.), how it may be handled, and exposure to light, humidity, and the chemicals given off by nearby objects, air sprays, etc. are all determining factors.</font></i>[/QUOTE]</p><p><br /></p>

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