I have checked the youtubes out there, and a lot of people are reclaiming the gold from printer cartridges and circuit boards and what have you. They make a solution from muratic acid (used in cleaning swimming pools and concrete) mixed with bleach. It seems to work in dissolving the gold, but I don't know what it would do to the metal underneath.
I have also thought about trying naval jelly. I am worried about hurting the hammer if I use the wrong stuff. It is a humpback from a registered magnum.

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John
SWCA #3401 SWHF #737