Hi Ginny
From high school, water is universal solvent, also have read that traces
of inorganic nickel have been found in the bodies of those who used
stainless steel. I haven't yet heard any chicken little stories about
cast iron.
  All inorganic minerals are supposed to be bad for us.
  Maybe paleo people had good reason to cook in skins.
William



> I agree about the value of the soup, but I had understood that the metal to
> avoid in cases of acid is aluminium. What would be the difference between
> stainless steel and cast iron. I would have thought that stainless is
> fairly impervious, as one sees it in medical uses a lot.
>
> ginny and Tomo
>
> All stunts performed without a net!