“Rainey Nickel
Raney Nickel,, not very readily available.unlike constantan..
any nickel or other'hydrogen' catalyst once modified may need
to be protected from oxygen H2O..(nitrogen? attack..
since it difficult for little H2 molecules to penetrate an oxide layer?
a tank of Argon is readily available..
but don't do as IH did and heat the catalyst in air...at 300 C more..or so