I am going to attempt to learn to rust blue (not going to make my first attempt on a Parker Invincible), but fail to see anywhere what type of tank must be used for the boiling process. I know to use distilled or deionized water, which would lead me to think that I need a stainless steel tank. But then I read that parts may be suspended on mild steel wire for boiling. Can a standard black iron tank be used for the boiling step? Appreciate any help you can give me.

LCSMITH