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I was wondering if anyone knows whether its nupastels are lightfast or not.
Earth colors are rated ASTM Lightfastness I - the highest lightfastness rating.
When you've painted all the colors you want to test for lightfastness , cut the sheet in half.
Label the swatches carefully, and expose to direct sunlight or a commercial lamp of the type used for testing lightfastness .
If a pigment has good lightfastness , it does not always mean that it has good weatherfastness
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