I mixed a non-hardening fixer recommended for prints, F-24 fixer. Here is the formula I used: Water (125F/52C) 500 ml Sodium thiosulfate (anhy) 152 g Sodium sulfite (anhy) 10 g Citric Acid 22 g Cold water to make 1000 ml I multiplied all values (except for temperature, of course) by 3.8 to make 3.8 litres/1 gallon. The mixture remained clear until I added citric acid. When I poured citric acid, the mixture turned milky. I researched that too much acid does this. My questions are: 1. Can I just add sodium sulfite again to remove the resulting sulfur precipitate? 2. Is there another reason why the mixture turned milky? 3. Can I still use the fixer even if the mixture turned out to be milky? 4. What should be the final color of the fixer after mixing? I let the solution stand for hours and now it is not as milky as when freshly mixed. What's the reason for this? The solution is yellowish, though. Should this be the final color of fixer 24? Can I still use this fixer? I hope for replies soon. Thanks.