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How to permanantly darken a brass zipper? Answered

I recently bought a coat, all black, but the zippers are a very bright brass. I'd like to darken them if I can, so they don't stand out as much. Any suggestions? Hopefully without staining or otherwise damaging the coat itself, which is a 55/45 cotton/polyester blend.


I've heard of steampunkers getting nice results using ammonia. Google around.

You want a product called "Brass Black" available at shooting supplies stores and refinishers.