Farmer's Reducer R4a

Cutting: For overexposed or fogged film

Part A
Potassium Ferricyanide37.5g
Water to make500ml
Part B
Sodium Thiosulphate (Hypo)480g
Water to make2000ml
Mixing Instructions: Add chemicals in specified sequence.
Dilution: to 850 ml of water add 30 ml of Part A and 120 ml of Part B to make 1L.
Usage: Pour solution into a white tray and immerse a wet negative. Agitate gently. Watch the action carefully and remove the negative as soon as the desired density is achieved. Immerse immediately into running water to stop the action. Wash thoroughly. The mixed solution has a short life, but the process can be repeated with fresh solution for further effect. To slow down the action increase the proportion of water in the working solution.