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Old 23rd Jan 2020, 10:58 pm   #22
rambo1152's Avatar
Join Date: May 2010
Location: Manchester, UK.
Posts: 1,824
Default Re: Black oxide coating on brass

Originally Posted by BigClick View Post
I thought the gongs were made black through a plate process? I thought I read that the brass had to be plated with copper before the blackening could happen.
Interesting you should say that. When I removed the black from the gongs of my No 1A Bell 40+ years ago (when I knew no better) I always thought the polished bare metal looked more like copper than brass. I've just removed the gongs and had a close look, and where the nut was screwed down the brass is showing, and is quite a contrast to the rest which looks orange in comparison.

I tried to photograph this difference in emissivity without success.
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