I enjoy the baking soda + aluminum foil technique on blackened silver.
Make a small bowl from aluminum foil. Put the coin on the bottom of the bowl. Boil a few cups of some water on the stove. Dump some baking soda in the water, mix. Pour the water and soda onto the coin and wait for about 10 mins.
See if the black the comes off with a little bit of rubbing with a cotton swab.
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