Hi, http://w3.gsa.gov/web/p/hptp.nsf has a lot of information on treating brass surfaces. Go to "All Procedures", click "search", type in "brass" and it comes up with a list of brass-related topics. Also, www.architecturalclassics.com/blog/how-to-age-brass/ explains how to get the right patina color. :dazed: I'm going to start working on my ugly Martin tenor right away. Good luck to you too.