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Old 29th Nov 2019, 10:54 pm   #2
Graham G3ZVT
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Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
Default Re: Black oxide coating

40 years ago, before I knew any better, I sanded down the case of my Bell No 1A and applied light oak polyurethane varnish, then polished the black gongs back to bare brass.

A little earlier than that I did the same to my late father's antique microscope, but the years are slowly growing the patina back.
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