Method of regenerating a spent photographic silver bleach solution

In a spent photographic silver bleach solution the ratio of ferrocyanide to ferricyanide has attained a value at which the efficacy of bleaching is so greatly impaired that the solution must be either discarded or regenerated. According to the present disclosure, regeneration is accomplished with an alkali metal halite that reacts with the ferrocyanide to oxidize it to a ferricyanide. The reaction takes place at a pH between about 6 and about 8. An acid preferably is present to prevent the reaction conditions from becoming so alkaline as to materially inhibit the oxidation.