That makes sense. I once asked "so what happens when I put gold foil on silver for enameling" and was told "you increase the gold content in your silver alloy" and silver is relatively benign as alloyants go. The Edwardian Era/Belle Epoque is noteworthy for platinum because it allowed haute joilerrie houses to make light, lacy constructions that would be impossible in gold or silver. Of course it also wants to be worked in an oxygen-free environment so it was mostly cold-formed stuff pinned together rather than castings or soldered components. So. Ever seen Pt/Mn? Any guesses what it would behave like? "manganese alloys" aren't really where I live. Only thing I know about alloying manganese with steel is it gets impressive and the only comparison I can draw between platinum and steel is neither likes oxygen and both can be made magnetic (which freaked me out when I first learned that).