My wife does acid etching of copper and brass with feric chloride and this is VERY similar to the process. If you want to keep certain areas from tarnishing you can try to use Sharpie pen on the metal before dunking. The Sharpie wipes off with alcohol afterwards. Could be super useful for the raised areas of the coin.
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⬆️ Thats a very good tip and something I didn't known.
Intresting, I would have never thought about the sharpie.