Best solution to clean silver coin?

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My wife has a Seated Dime love token on a necklace (I found one with her initials on Ebay a few years ago!) and she doesn't like the toning, which has darkened over time, a dark gray. She asked me to clean it for her.
I've never put a coin in anything but acetone. What is best to "shine up" her dime?
My wife has a Seated Dime love token on a necklace (I found one with her initials on Ebay a few years ago!) and she doesn't like the toning, which has darkened over time, a dark gray. She asked me to clean it for her.
I've never put a coin in anything but acetone. What is best to "shine up" her dime?
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Comments
Dan
First Place Winner of the 2005 Rampage design contest!
Soak (no scrubbing, please).
lots of time, lots of time.
even more time. . .more heat
. . .and some more time and heat. . .
will get most of the sulfer based "tarnish" off the silver coin without hurting a single atom of the silver.
Glenn