#color_property__colorproperty  an attribute of color
  supertype:  #visual_property  an attribute of vision
  subtype:  #hue  the quality of a color as determined by its dominant wavelength
  subtype:  #chroma__saturation__intensity__vividness__vividnes  chromatic purity: freedom from dilution with white and hence vividness of hue
  subtype:  #value.color_property  relative darkness or lightness of a color: "I establish the colors and principal values by organizing the painting into three values--dark, medium...and light"-Joe Hing Lowe
     subtype:  #lightness__lightnes  having a light color
     subtype:  #darkness  having a dark or somber color

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