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Ink fading in Sunlight

  1. Aug 26, 2009 #1
    I have a book with a green cover. I left it on a window sill in direct sunlight for about a week and now the colour on the exposed side has clearly faded. Why does this happen? Is it something to do with the Ultra Violet properties of sunlight destroying the pignments in the ink?
     
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  3. Aug 26, 2009 #2

    Andy Resnick

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    That's my understanding: the UV radiation chemically breaks apart the dye molecules.

    http://www.oddparts.com/ink/faq19.htm [Broken]
     
    Last edited by a moderator: May 4, 2017
  4. Aug 26, 2009 #3

    DaveC426913

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    BTW, I have noticed that the yellow/green dyes commonly used are particularly prone to fading.

    If you look at signs is shop windows, they are almost invariably magenta/blue-biased as they fade. This means that magenta's and blue's complementary colours - green and yellow - are fading first.
     
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