Brown tarnish on brass plate

[David KParticipant @davidk77137]

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?

[David KParticipant @davidk77137]

[roy entwistleParticipant @royentwistle24699]

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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