This retains its colour after washing and drying, but cannot be recommended as a pigment, being liable to suffer in contact with organic substances, which deoxidize and decolourize the manganates and permanganates.    From Wordnik.com.  [Field's Chromatography or Treatise on Colours and Pigments as Used by Artists] Reference

This process unfortunately requires for its prompt success the use of a very large quantity of spiegel or of ferro-manganese, in order to sufficiently carburize and deoxidize the burnt iron, which is the final product of the blowing.    From Wordnik.com.  [Scientific American Supplement, No. 315, January 14, 1882] Reference

Silicon, like manganese, is an important constituent of many steels, the alloy ferrosilicon being added to deoxidize and purify the metal and thus to increase its tensile strength.    From Wordnik.com.  [The Economic Aspect of Geology] Reference