Michael- Why are you black rhodium plating silver? To do so will
involve first plating it with a base coat of nickle I believe, and
then the black rhodium which is not really all that durable. It wears
off pretty quickly.
You can't plate rhodium directly over silver.
My advice is to oxidize it and then tumble it. The tumbling helps
really burnish the oxidation into the surface of the metal and it
seems to wear better than normal oxidation or black rhodium. Go to
"Limited Editions" and look at their bracelets. Our friends Jack and
Lizzie have been making their Estrusco line for years with just this
I love Jack and Lizzie's work and collect it for myself. I'd collect
Marianne Hunter's work too if I could.
Have fun and make lots of jewelry.