George, All the papers on photo chemistry state that sodium sulfite at low concentration will just act as preservative or anti-oxidant. It means 2,0% or so. D-76, for instance, asks for 10%. That's why it's known as a fine-grain developer, but as you may easily find looking around, it will not "eat" your ISO ratings a bit! So, there seems to be some ways to overcome it's solvent action. The suggestion of trying fine-grained films really seems to be the best, since reducing grain size by chemical means may compromise resolution and some other structural habilities of any emulsion. Get a tripod and go ahead.(posted 8544 days ago)Cesar B.