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Adjective: colourfast  'kú-lu(r),fãst
Usage: Brit, Cdn (US: colorfast)
  1. Having colour that is resistant to fading or running
    "Check to see if your washed fabric is colourfast"; "You should make vast amounts of the fabric colourfast";
    - colorfast [US]

See also: imperviable, impervious

Encyclopedia: Colourfast