#soiling__soilure__dirtying  the act of soiling something
  supertype:  #change_of_state  the act of changing something into something different in essential characteristics
  subtype:  #spotting__staining__maculation  the act of spotting or staining something
  subtype:  #contamination__pollution  the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
     subtype:  #dust_contamination  the act of contaminating with dust particles

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