lightfast

adjective
light·fast | \ˈlīt-ˌfast \

Definition of lightfast 

: resistant to light and especially to sunlight especially : colorfast to light

Other Words from lightfast

lightfastness \ˈlīt-ˌfas(t)-nəs \ noun

First Known Use of lightfast

1950, in the meaning defined above

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The first known use of lightfast was in 1950

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