Two Packs of Powder Insure Long Shelf Life. | An Economic, Versatile, Powder Developer and Replenisher System for Processing Large Volumes of all General Purpose Black and White Films. | A Fine Grain Film Developer for all General Film Processing Requirements Where Fine Grain Negatives are Required Without Loss of Emulsion Speed. | Ensures the Best Balance of Fine Grain, Sharpness and Tonal Rendition Producing Negatives which allow a High Degree of Enlargement.