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Definition of "lightfast" [lightfast]

  • Resistant to fading. (adjective)

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Use "lightfast" in a sentence
  • "The ratings range from Class I (very lightfast) to Class V (very fugitive)."
  • "The most lightfast pigments around are the iron oxides, which are harmless to the environment."
  • "" I would guess that as compounds are made to be more lightfast that they tend also to be harder on the environment.""