Light-fastness

Discussion in 'Print Glossary' started by Color Printing Forum Admin, May 13, 2007.

  1. Color Printing Forum Admin

    Color Printing Forum Admin Administrator

    Joined:
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    The resistance of inks to the spectrum of natural light.

    According to the German standard DI 54003/4, the “wool scale” defines eight levels from “very low” to “excellent”.

    Level 3 (moderately light-fast) indicates that the ink can be exposed to sunlight for 4 to 8 days in summer and 2 to 4 weeks in winter without any noticeable fading.

    At the highest level of light-fastness, the ink can withstand exposure to summer sun for more than 18 months.