The solution you're asking about is Ferric Chloride. It dulls hardware that are nickel plated in about 10 seconds, unfortunately gold plating makes it non-reactive. That's precisely why Gotoh developed the X-Gold finish, to simulate the now popular and trendy "raw brass" hardware which has naturally aged.
This is a fairly common topic at Banjohangout.org in the building, setup, and repair forum if you want to see what else is recommended.
Last edited by Rudy4; 01-16-2017 at 11:26 PM.
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