#mordant  a substance used to treat leather or other materials before dyeing; aids in dyeing process
  supertype:  #coloring_material__colouring_material__colouringmaterial__color__colour  any material used for its color
  subtype:  #chrome_alum  a violet-colored salt used in hide tanning and as a mordant in dyeing
  subtype:  #tartar_emetic__tartaremetic__antimony_potassium_tartrate  a poisonous colorless salt used as a mordant and in medicine
  subtype:  #sodium_dichromate__sodium_bichromate  a red-orange salt used as a mordant

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