KODAK ACID HARDENING FIXING BATH F-5

600 ml Water (125F or 45C)
240 g  Sodium Thiosulfate
15 g  Sodium Sulfite
48 ml Acetic Acid (28%)
7.5 g  Boric Acid (Crystals)
15 g  Potassium Alum
Top up to one litre water

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: Photo Lab Index, Lifetime Edition, Morgan and Morgan, Inc., Dobbs Ferry, New York.