Dip in solution or brush or sponge on. Place in a hot box for 30 min at 175'F. Transfer to humidity box. This may be a box into which live steam is introduced. When the temperature reaches about 150'F shut off the steam and allow to stand in the box until a uniform film of red rust forms. Immerse in boiling water until the red rust is converted to a black oxide. Dry and scratch brush with a steel wire brush. Repeat all of above of above three times. Oil with linsed oil.
地址：山东省烟台市开发区南昌大街48号
