Silver bezel on depletion silvered pieces

I have begun routinely depletion silvering my cloisonne’ pieces. I
use a brass brush to burnish between heatings. I wonder what some of
you have done on bezels? I have wound up brushing them too. Are some
of you leaving them unbrushed and highly polished?

While I’m on that subject, I use fine silver bezels but I am always
amazed to see oxidation on them at least as early as the oxidation
appears on the body of pieces I have not used the depletion process
on. I’m not sure why that happens?

J. S. (Sue) Ellington