...protection against "green skin". Any ideas on how to treat the
metal that will come in direct contact with the skin?
Elkka, have you checked the Orchid Archives on this topic? In
general, it helps to oxidize the jewelry in something like Jax
Black, rub off the excess with a slurry of damp pumice, and (in my
experience) the jewelry will cause little or no "green skin."
All the best,