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What Has Happened To These Coins?

 
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Author Previous TopicReplies: 3 / Views: 177Next Topic  
New Member

United Kingdom
8 Posts
 Posted 11/19/2020  6:59 pm Show Profile   Bookmark this topic Add Coin2009K to your friends list Get a Link to this Message
I have a number of coins with this sheen/shine to them. They are in no way unc but I'm really curious what could have caused this? Any helpful ideas appreciated.


*** Moved by Staff to a more appropriate forum. ***
Valued Member
Poland
229 Posts
 Posted 11/20/2020  02:27 am  Show Profile   Check norantyki's eBay Listings Bookmark this reply Add norantyki to your friends list Get a Link to this Reply
Acid treated, they are severely damaged.
New Member
United Kingdom
8 Posts
 Posted 11/20/2020  04:59 am  Show Profile   Bookmark this reply Add Coin2009K to your friends list Get a Link to this Reply
Is that in a very bad attempt to clean them?
Pillar of the Community
United Kingdom
7727 Posts
 Posted 11/20/2020  06:32 am  Show Profile   Check NumisRob's eBay Listings Bookmark this reply Add NumisRob to your friends list Get a Link to this Reply
They look to me as if they have very porous surfaces. I would guess that they are detector finds that have been dug up and cleaned.

The British pennies and halfpennies up to 1958 were struck from 95.5% copper, 3% tin, and 1.5% zinc. Afterwards they were struck in 97% copper, 0.5% tin, and 2.5% zinc (this alloy had previously been used during WW2). The 97% copper coins with the reduced amount of tin corrode badly in some soils and it may well be that a detectorist found these coins and cleaned them to aid identification - they were of no real collector value whether cleaned or not.
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