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wiki:darkroom:chemistry:formulas:farmers_r4b

Farmer's Reducer (Kodak R4b)

Proportional: for overdeveloped film

Preparations

Prepare stock solutions as described below:

Part A

Water, 500 ml
Potassium Ferricyanide, 7.5 gr
Water, to make 1000 ml

Part B

Water, 500ml
Sodiumthiosulphate (Hypo), 200 gr
Water, to make 1000 ml

Instructions for use

Use parts A and B separately. Immerse a wet negative in Part A for 1-4 mins, agitating gently. Watch the action carefully and remove the negative as soon as the desired density is achieved. Then immerse in Part B for 5 mins, remove and wash thoroughly.This process may be repeated as required.

Notes

For general fogging, dilute Part A with 50\% water. Both solutions have a long shelf life and can be stored for future use.

wiki/darkroom/chemistry/formulas/farmers_r4b.txt · Last modified: 2022/01/20 21:28 by henpe

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