LIQUID BLUEING.
Reading edition
Soluble Blue 8 lbs.
Oxalic Acid 2 ”
Mix the blueing and acid together in a tub with about five gallons of boiling water, stir it until it is well dissolved, add from ten to twenty gallons more of hot water. Keep stirring. Turn a hose into a barrel sitting on end with a spigot at lower edge over the tub, let it open, and dip the blueing from the tub into the barrel and keep it going constantly until both barrel and tub is filled and well mixed. This will make about 75 gallons of blueing; let it settle before drawing off.