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All Forums Category: World Coins and Currency Forums Forum: World Coins and Commemoratives

Rough Surface On Thai Coin?

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Author Previous TopicReplies: 5 / Views: 1,033Next Topic  
BillSnyder
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 Posted 03/24/2017  6:09 pm Show Profile   Bookmark this topic Add BillSnyder to your friends list Get a Link to this Message Number of Subscribers
What happened here?



Rough-Surface-On-Thai-Coin?



Thanks,
Bill
Justinokay
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 Posted 03/24/2017  6:30 pm  Show Profile   Bookmark this reply Add Justinokay to your friends list Get a Link to this Reply
The coin looks rusted?
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Numister
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Singapore
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 Posted 03/25/2017  1:19 pm  Show Profile   Bookmark this reply Add Numister to your friends list Get a Link to this Reply
Seawater corrosion most probably.
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Dennman
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Canada
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 Posted 03/25/2017  1:49 pm  Show Profile   Bookmark this reply Add Dennman to your friends list Get a Link to this Reply
I'm with Numister. My first thought was salt water corrosion. I've seen many salt water metal detecting finds that show different stages of corrosion depending on the length of exposure and metal composition.Alloyed coins get a granular surface.
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BillSnyder
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 Posted 03/26/2017  6:53 pm  Show Profile   Bookmark this reply Add BillSnyder to your friends list Get a Link to this Reply
Thanks, Numister and Dennman.

Sea (salt) water corrosion seems quite likely.



Bill
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colonialjohn
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 Posted 03/27/2017  08:50 am  Show Profile   Bookmark this reply Add colonialjohn to your friends list Get a Link to this Reply
I agree ... why are shipwreck coins of silver sometimes 99% pure ... the most oxidized metal in the alloy makes it way to the surface and it actually leaves the alloy (i.e., copper). What is happening here with that green patina in that INSERT ... <VVBG>.

JPL
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All Forums Category: World Coins and Currency Forums Forum: World Coins and Commemoratives



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