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All Forums Category: General Numismatic Forums Forum: Main Coin Forum

Copper Nickel Coin , Red Surface Patina Or Corrosion?!

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chronos
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Lebanon
505 Posts
 Posted 01/07/2021  09:11 am Show Profile   Bookmark this topic Add chronos to your friends list Get a Link to this Message Number of Subscribers
Hello,
i saw few days ago a copper nickel coin Lebanon 1 Piastre it has a red color surface, first time I saw this color on this metal coins , is it patina or corrosion?

Copper-Nickel-Coin-,-Red-Surface-Patina-Or-Corrosion?!

*** Edited by Staff - Removed link and added images here. ***
Edited by chronos
01/07/2021 09:57 am
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Eligius
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Netherlands
175 Posts
 Posted 01/07/2021  12:01 pm  Show Profile   Bookmark this reply Add Eligius to your friends list Get a Link to this Reply
It is corrosion. When a copper-nickel coin is put in an acid (e.g. Citric or acetic acid), the nickel in the surface is dissolved. Copper remains unaffacted. This results in a red, copper colour of the coin.
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Numiscrat
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United States
221 Posts
 Posted 01/07/2021  2:48 pm  Show Profile   Bookmark this reply Add Numiscrat to your friends list Get a Link to this Reply
I agree that is a likely cause.

Eligius,



As a chemist with some specialization in corrosion and electrochemistry, it makes me happy to see someone explain what is called "selective leaching" or "dealloying," as opposed to just calling the phenomenon "staining." Well done! Thank you!
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All Forums Category: General Numismatic Forums Forum: Main Coin Forum



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