rhodium - mohs and vickers
Rhodium is a wonderful metal because it is non-corrosive, like gold, but, unlike gold, is quite scratch resistant. For this reason, it is often use as a final coating on silver and gold jewelry. But how hard is hard? And what does that mean? It turns out that there are a number of hardness scales. Two which jewelers and metal workers use are mohs and vickers. I'm still looking for a non-web source (no, it isn't in the CRC) so, for the time being, the reference goes to artisanplating.com.
Now I bet you are wondering what mohs
Buying precious metals
My specifications: 0.050 in. wire/rod, 1 ft. in length.
I also found New England Precision Griding's Quick Wire Program
, which specializes on medical devices. No pricing though. They have all sorts of crazy things. Probably not the right place for me.