#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

No statement uses or specializes discolouration; click here to add one.