lightfastness

/ˈlaɪtˌfæstnəs/
noun
  1. The quality or degree of being resistant to fading or damage from light exposure.
    • The lightfastness of this ink is rated as excellent, so it's ideal for archival documents.
    • Manufacturers test the lightfastness of their dyes to ensure long-lasting colors.
    • Artists often check the lightfastness rating of paints before buying them.
Antonyms
What does "lightfastness" mean? | whatsthatwordmean | whatsthatwordmean