My regular Alabaster customers have not been posting to Orchid...
Take a look at http://www.950pd.com for most of the you
seek. As I said, Alabaster I is the good one for torch casting,
Alabaster II is very difficult to cast unless you use an induction
caster set at a lower power.
Platinum investment (Doc's or your favorite) Platinum crucible. Same
flask heat as for Pt.
My next project may well be Alabaster III, nickel free and easier to
cast like with a propane or methane torch.
New metals can be challenging. The good news-everything else but
casting is easy with pd.