I've had this coin for quite a while and if my memory serves me correctly the toning seems to have advanced in the last five years, if it continues I'll soon have a black coin. Open for discussion, why this coin is toning so darkly?
It almost looks like heat was applied to it, like a candle. Interesting that it is turning that way on its own. Where/how has it been stored over the last 5 years?
PMD caused by a torch of some sort. Is it possible that the high temperature from the heat played a role in the long term toning on your coin. That is, the heat broke down certain chemicals within the coin allowing it to tone more easily? I have seen this happen with tempered steel when it gets reheated and then sits for a long period of time.
but wouldnt that make the copper move. it does not take much heat to effect that copper plating. if it does not rub off. it can not be smoke. it has a very different look appealing when it comes to tone.
This doesn't look like heat damage but unless I can come up with a better explanation I certainly wouldn't argue the point. In hand it sure looks like toning with a dark steel blue colour that has a glossy appearance when held at the proper angle. Appreciate all the replies so thanks to all.
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