Oh yes, of course it's the acid that dissolves. Silly me. HF:SbF5, if I'm correct?
By the way, I remembered a good page for European element collectors:
http://www.elemente.at.cx/
The page is in German, but you'll probably understand enough. At least I did, and I've never studied the language. The prices are reasonable, and that's the only page I've ever seen to have such a marvellous variety of elements. Some of the 1-82 range elements are missing, though, but smack me in the face if you've ever seen curium for sale before.