maintaining brightness/luster on copper and brass coins

hikeinmts

Bronze Member
Dec 13, 2008
1,268
30
South Korea
Detector(s) used
Cobra II/Minelab Sovereign
Primary Interest:
All Treasure Hunting
Most of the coins I find are brass or copper.....they are holed coins, found in Korea.
I have found several thousand, and have thought about making some of them into Jewelry, mounting them into
bezels, and putting them on a chain.
PROBLEM: The coins look very nice after cleaning them, but left out for several weeks, they develop "coin cancer."
They end up with spots, or turning a dark color.
Any idea what I could use as a coating for them that will insure that they stay bright and shiny?
Appreciate any help you can give. Thanks.
 

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