Farmer's reducer is:: (A) Potassium sulfite + Sodium sulphate, (B) Potassium ferricyanide + Sodium thiosulphate, (C) Potassium sulfite + Sodium hydroxide, (D) All of the above
Answer is B. Farmer's Reducer is composed of separate solutions of Potassium Ferricyanide and Sodium Thiosulfate (plain hypo). These are usually combined just before use or are used as a two bath treatment.