>>2934390Kodak Fixing Bath F-6
Odorless Bath for Films, Plates, and Papers
Water, about 50 Celsius (125° F.) 600 ml
Sodium Thiosulfate (Hypo) 240 g
Sodium Sulfite, desiccated 15 g
* Acetic Acid, 28% 48 ml
Kodalk 15 g
Potassium Alum 15 g
Cold water to make 1 liter
* To make approximately 28% acetic acid from glacial acetic acid, dilute three parts of glacial acetic acid with eight parts of water.
Dissolve chemicals in order given. To prevent sulfurization, mix the potassium alum separately in a small amount of hot water then add this last with rapid stirring.
This bath should be used in conjunction with a stop bath such as Kodak Stop Bath SB-1 or Kodak Stop Bath SB-1a, or an acid hardening bath such as Kodak Hardening Bath SB-3 to obtain the full useful hardening life. The hardening life (capacity) is equal to that of Kodak Fixing Bath F-5 provided an acid stop bath is used. With a water rinse the life is about one-half that of Kodak Fixing Bath F-5.
The hardener may also be mixed separately as a stock solution as detailed in Kodak Hardener F-6a.
Kodak Hardener F-6a
Stock Solution For Preparing Kodak Fixing Bath F-6
Water, about 50 Celsius (125° F.) 600 ml
Sodium Sulfite, desiccated 75.0 g
* Acetic Acid, 28% 235.0 ml
Kodalk 75.0 g
Potassium Alum 75.0 g
Cold water to make 1.0 liter
* To make approximately 28% acetic acid from glacial acetic acid, dilute three parts of glacial acetic acid with eight parts of water.
Dissolve chemicals in order given.
Add one part of the cool stock hardener solution slowly to 4 parts of cool 30% hypo solution (2.5 pounds per gallon of solution), while stirring the hypo rapidly
