Will post as soon as I get a chance to look it up.
Originally Posted by van eynde ludo
Edit: Here it is. Stock: 200 g sodium sulphite, 40 g sodium metabisulphite, water to make 1 liter. Dilute 1:9 for use. Alternatively, 20 g sodium sulphite, 4 g sodium metabisulphite and water to make 1 liter, use as is.
The latter should cover a good number of films, and it is probably not necessary to make a stock solution. I must try and find out what the chemical mechanisms are that makes sulphite effective to remove fixer. Nearly all fixer formulas contain sulphite or bisulphite in varying quantities, so I am starting to doubt that it is a chemical reaction with the thiosulphate. It may have to do with elevating the solubility of the silver halide salt complexes. Anyway, a chemist can explain that one to us.
Last edited by dorff; 11-28-2012 at 06:55 AM. Click to view previous post history.