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Brown tarnish on brass plate

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David K14/06/2019 21:37:04
258 forum posts
259 photos

Hi , I made a Congreve clock about 4 years ago , the brass has a bright polish and coated with Renaissance wax. Its kept in a glass case.

On the brass plates I keep getting a brown mark , almost like a light rust, just in a couple of small areas. I can polish it out but it always seems to come back .

Is this caused by a bit of contamination in the brass plate itself?

roy entwistle15/06/2019 08:34:19
1716 forum posts

Iv'e got similar on a chapter ring but I can see an obvious fingerprint in one of them so suspect all grease from handling was not removed

Roy

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