#discolouration__stain__discoloration  a soiled or discolored appearance; "the wine left a dark stain"
  supertype:  #visual_aspect__appearance  outward or visible aspect of a person or thing
  subtype:  #scorch  a discoloration caused by heat
  subtype:  #bloodstain  a discoloration caused by blood
  subtype:  #iron_mold__iron_mould  a spot caused the staining with rust or ink
  subtype:  #mud_stain__mudstain  a stain produced by mud
  subtype:  #oil_stain__oilstain  a stain produced by oil
  subtype:  #tarnish  discoloration of metal surface caused by oxidation

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