<prompt> Farmers reducer is:Potassium sulfite Sodium sulphatePotassium ferricyanide Sodium thiosulphatePotassium sulfite Sodium hydroxideAll of the above  <response>: Farmers 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. 