ORIGINAL MESSAGE:
On Tue, 9 Mar 2010 19:31:55 -0800, Robert Friess <rfriess@usa.net>
wrote:
>
>American gold coins are about 10% copper and they do not oxidize.
REPLY:
Don't know about coins, but the gold used on contacts does develop
some kind of film over time. I assume it is copper oxide but that's
just a guess. Whatever it is, removing it brightens up the gold and
restores conductivity.
73, Bill W6WRT
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