#change_of_color  an act that change the light that something reflects
  supertype:  #change_of_state  the act of changing something into something different in essential characteristics
  subtype:  #whitening__lightening  changing to a lighter color
     subtype:  #bleach  the act of whitening something by bleaching it (exposing it to sunlight or using a chemical bleaching agent)
  subtype:  #blackening__darkening  changing to a darker color
  subtype:  #discoloration__discolouration  the act of discoloring something
  subtype:  #coloring__colouring  the act of of process of changing the color of something
     subtype:  #tinting  the act of adding a tinge of color; "the hairdresser gave her hair a modest tinting"
     subtype:  #hair_coloring  the act of dyeing or tinting one's hair
        subtype:  #rinse.hair_coloring  the act of giving a light tint to the hair
     subtype:  #dyeing  the use of dye to change the color of something permanently
        subtype:  #staining  (histology) the use of a dye to color specimens for microscopic study
           subtype:  #Gram's_method__Gram_method__Gram's_procedure__Gram's_stain  a staining technique used to classify bacteria; those that retain the gentian violet are gram-positive and those that do not retain it are gram-negative

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