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I use citric acid to clean my brass all the time and found that it will plate the brass with a very thin layer of copper if the concentration is too high.
It is NOT platting the brass with copper, it is removing the zinc from the brass.
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Either way, it's a very, very small amount of material and has never impacted the life of my brass. Light buffing and it's yellow brass again, so whatever occurs is only happening in a layer so thin that it can generally be removed by steel wool. I just reduced the concentration a bit and the problem went away.