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What causes discoloration like this?
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<p>[QUOTE="lordmarcovan, post: 3497823, member: 10461"]Lots of environmental factors can cause it. Heat is one. Sulfur is one of the chemicals which can react with the coin's metal. Ground minerals, if it has been on or in the ground, can be another. Since this one is only toned/discolored on one side, I'd say it was lying face down somewhere, with the reverse side up and exposed to the elements.[/QUOTE]</p><p><br /></p>
[QUOTE="lordmarcovan, post: 3497823, member: 10461"]Lots of environmental factors can cause it. Heat is one. Sulfur is one of the chemicals which can react with the coin's metal. Ground minerals, if it has been on or in the ground, can be another. Since this one is only toned/discolored on one side, I'd say it was lying face down somewhere, with the reverse side up and exposed to the elements.[/QUOTE]
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What causes discoloration like this?
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