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<p>[QUOTE=&quot;jody526, post: 3427, member: 578&quot;]Copper is a very reactive metal. It tarnishes quite easily, when it comes in contact with any impurities in the air.</p><p>Proof cents are very succeptible to spotting. Even talking over one, can transfer small moisture droplets onto the surface of the coin.</p><p>Over time these spots can become darker, and more noticeable.</p><p>The impurities may have been there before it left the Mint, or it may have something to do with the way it has been stored since it left the Mint.</p><p>Make sure you store your coins in a cool, dry place, with low humidity, to reduce the chance of spotting or toning.[/QUOTE]</p><p><br /></p>

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