RAPID FIXER CONCENTRATE
Part A:
900 mL Ammonium Thiosulfate
40 g Sodium Sulfite
28 ml Glacial Acetic Acid
20 g Boric Acid (Crystals)
Top up to one litre water
Part B:
60 g Water
40 g Aluminum Sulfate
2.5 g Sodium Bisulfate
Water to make 106 mL
Mixing: To one quart of water, add one-half of solution A. Add slowly, with stirring, 53 ml of Solution B. Add Water to make one-half gallon of Fixer.
Fixing Time: Twice the time it takes to clear a plate, usually 2 to 4 minutes.
Temperature: 20C Agitation: Intermittent
Shelf life: This stock solution lasts practically indefinitely, dump it when it starts to take longer than 5 minutes to clear a plate
Source: 150 Do-It-Yourself Black and White Popular Photographic Formulas, Patrick D. Dignan, editor, Dignan Photographic, Inc., North Hollywood, CA, 1977