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if it's blue, then it's been exposed to oxidation, which caused the color change. It's not natural for it to be all one color like that, so I'd have to say it's been exposed to some kind of chemical that reacted with it to cause the color change. This artificial toning is not desirable to collectors, but you might find someone willing to give you a tiny bit over face value for the novelty value.
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∙ 8y ago
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