Definition of lightfast in English:

lightfast

Syllabification: light·fast
Pronunciation: /ˈlītˌfast
 
/

adjective

  • (Of a dye or pigment) not prone to discolor when exposed to light.
    More example sentences
    • The Bisphenol A bischloroformate is then reacted with another chemical to produce a lightfast epoxy resin.
    • I was wondering if anyone knows whether its nupastels are lightfast or not.
    • Need the right expert in lightfast dye?

Derivatives

lightfastness

noun
More example sentences
  • When you've painted all the colors you want to test for lightfastness, cut the sheet in half.
  • If a pigment has good lightfastness, it does not always mean that it has good weatherfastness
  • This pigment identification project and a lightfastness standard can only lead to the increased recognition of this fine art medium.

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Pronunciation: skəʊʃ
noun
a small amount; a little