Coins With "blisters"

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Author	Replies: 4 / Views: 1,545
BillSnyder Pillar of the Community 778 Posts	Posted 08/16/2013 3:01 pm A friend has asked help with this coin - I've seen this type of thing before but can only guess the cause. Thanks for your help, Bill Report this Post to the Staff

amida17 Pillar of the Community United States 4897 Posts	Posted 08/16/2013 7:19 pm Heat damage maybe? Report this Post to the Staff
Pertinax Pillar of the Community United Kingdom 2135 Posts	Posted 08/16/2013 7:25 pm Could you post the other side, please ? Report this Post to the Staff
BillSnyder Pillar of the Community 778 Posts	Posted 08/16/2013 8:22 pm Yes, my thought was heat damage also. Not sure though. I will ask for a picture of the reverse. Report this Post to the Staff
Sap Moderator Australia 16850 Posts	Posted 08/16/2013 11:06 pm Such "blisters" are often caused by corrosion of the underlying metal. Especially for the more reactive metals: copper, bronze, aluminium zinc and steel. Such coins often form a protective oxide layer that prevents further corrosion; some more modern versions are made from plating an unreactive metal (such as nickel) over a reactive metal (such as steel). Either way, if the layer gets a pinhole flaw in it and the coin is then place din a moist, corrosive environment, the hole lets corrosive elements through the layer and a "bubble" of corrosion forms underneath, lifting up the surface. The trouble is, in this particular case, I'm pretty sure the coin is supposed to be silver. So either we're looking at a plated fake, or something rather odd has happened to this coin. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis Report this Post to the Staff
	Replies: 4 / Views: 1,545

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