Federal supply schedule, FSC group. 68. Chemicals and chemical products, pt. 1, sec. A, FSC class 6810, Acetone, aluminum sulphate, ammonium hydroxide, calcium chloride dihydrate, hydrochloric acid, FSC class 6850, Plate-cleaning fluid, Nov. 15, 1960-Nov. 14, 1961; prepared by National Buying Division.