How to permanantly darken a brass zipper?

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.

CameronSS8 years ago
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.
kelseymh8 years ago
The word you're looking for is "tarnish." With that in mind Google Is Your Friend.