The Darkroom Cookbook Forum

The formula for F-24 fixer suggests that substitution of Citric acid for Sodium bisulfite will reduce the odor. DON'T DO IT! Adding 22gm/liter of Citric acid results in the generation of Sulfur dioxide and makes for an extremely unpleasant and genuinely dangerous darkroom experience, especially if y...

Formula #138 for Kodak F-24 fixer suggests that "substituting 22.0 grams of Citric acid for the (25.0 grams of) Sodium bisulfite will largely eliminate the fixer odor. Is this really correct? I tried it yesterday and got a really nasty surprise - I think it evolved Sulfur dioxide, which was qui...