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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins

Black Spots On Coins

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Author Previous TopicReplies: 2 / Views: 679Next Topic  
rooksmith
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United States
10 Posts
 Posted 08/05/2021  1:00 pm Show Profile   Bookmark this topic Add rooksmith to your friends list Get a Link to this Message Number of Subscribers
Here are some Junk Coins that were 'stored' in an attick in a ziplock with some silica dessicants. The Black spots are some sort of carbon or oxide. There were lots of Zinc/copper Manganese pennies with spots. But what I was curious about is the spots on Clads.

Whats up with that?
Black-Spots-On-Coins
halfamind
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1501 Posts
 Posted 08/05/2021  4:00 pm  Show Profile   Bookmark this reply Add halfamind to your friends list Get a Link to this Reply
Copper is copper, whether plating, cupronickel clad, or a 95% alloy. Once the copper "catches the disease" (of oxidation, etc.), it can spread and affect Zincolns, Lincolns, and clads alike.

Probably all "spenders" now, unfortunately.
Edited by halfamind
08/05/2021 6:56 pm
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Cujohn
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 Posted 08/05/2021  6:57 pm  Show Profile   Bookmark this reply Add Cujohn to your friends list Get a Link to this Reply
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