Does anyone know what metal mouthpieces are made from and coated with? I've noticed recently that I get dermatitis on my lip when I've been playing my Bb cornet with a metal DW mouthpiece I've had for about 10 years in a relatively short amount of time. To try and avoid this I've switched to a plastic one which is taking some getting used to. In the meantime, I'm helping a band out on sop for the areas and am playing on a DW metal mouthpiece, bought about 2 years ago and not played on much. It's taken about 2 months for some dermatitis to come about as a result of that which started in the last week or so. However, to complicate it more, I played the trumpet on a mouthpiece which is about 15 years old at the weekend which might have something to do with it too.
I've been patch tested for the most common metals including nickel, chromate and cobalt, and currently have a palladium patch on my arm to see if it's that. All tests have been negative so far. I'm looking to see if anyone has any ideas what to try patch testing next - is there copper in mouthpieces?