Sealing brass (bronze and copper for that matter)

You’re absolutely right! I have a Ph.D. in music so know those brass instruments pretty well, but hadn’t thought of them when is comes to jewelry. And, we have a whole bunch of brass lamps in our house. They’re sealed with something. The woman at Rio Grande Jewelry told me brass is the most reactive metal there is. Here in the jewelry business we’re missing something.
Thanks for your reply.
Dick
Ah Mexico! Where “C” on a faucet means HOT, and “M” on a restroom means THE LADIES ROOM.