I've researched on two other fixer formula because F-24 is a slow fixer. I want a rapid fixer. Here are the formulae: Neutral rapid fixer ammonium thiosulfate (60% solution) 200ml sodium sulfite 15g sodium metabisulfite 5g water to make 1 liter However, I've read that ammonium in fixer is not for open trays because of the ammonium fumes. ~ So, here is another formula, the TF-2 Alkaline Sodium Thiosulfate Fixer Distilled water 1000 ml Sodium Thiosulfate 250 g Sodium Sulfite (anhy) 15 g Sodium Metaborate 10 g TF-2 will wash out of negative and print materials more rapidly than will an acid fixer. In jackspcs.com, it was not indicated how long PRINTS should be fixed in this specific fixer (but it was indicated it should be washed for 30 minutes). My questions are: 1. The resource for the neutral rapid fixer formula didn't indicate the length of time for fixing FB prints. How long should FB prints be fixed in neutral rapid fixer? 2. Which fixer (neutral rapid fixer, or TF-2 alkaline) would you recommend? 3. If TF-2, how many minutes does it take for FB prints to be fixed in this fixer? 4. I assume that since ther is no alum in either formula, then these fixers are non-hardening fixers. Is my assumption right? 5. Would you know other rapid fixer formula/e that would work with FB prints? If you do, and if you recommend that fixer, please post the formula here. Bear with me as I am only beginning to learn mixing my own chemicals. I really hope you can help. Thanks.