Quote Originally Posted by Michael R 1974 View Post
If this is indeed what Rafal is looking for, not likely to work very well. Haist briefly discusses Sodium Sulfite under "other fixing agents". As we know from film developers, Sodium Sulfite is a silver halide solvent, but it is a weak one.
There are different challenges for fixing bath 1 and fixing bath 2. Fixing bath 1 should remove the bulk of the Silver Halide which means you need something that can bind a few g/l of Silver ion. Sulfite certainly won't do that, especially in the presence of matching amounts of Bromide or Iodide.

Fixing bath 2, on the other side, neither has much Silver to deal with nor much Bromide/Iodide to compete against, so the numbers look much more favorable for a weak Silver solvent that washes out easily.