Re: Black oxide coating
I had some candlestick telephone parts chemically blackened a couple of years ago at a local electroplating company. It was a bit experimental for them as they hadn't attempted before, I think they said the original oxidised finish involved cyanide and a process no longer allowed/used, but they achieved reasonable results. The finish had a very slight brown hue and was quite a matt sheen but looked better than bright brass for that application. There's bound to be some electroplaters to approach in Sheffield!
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