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What causes paint to change colour over time?

  1. Feb 24, 2016 #1
    What compounds,reactions and factors cause modern day paint to change hue intensity over time? Any help appreciated.
     
  2. jcsd
  3. Feb 24, 2016 #2

    Borek

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    Staff: Mentor

    I guess it depends on the paint, so you won't get a "one size fits all" answer.
     
  4. Feb 24, 2016 #3
    Pick any you know the most about,
     
  5. Feb 24, 2016 #4

    phinds

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    2016 Award

    Oxidization due to exposure to the air and fading due to exposure to UV (sunlight, even indirect) are the two primary causes.
     
  6. Feb 24, 2016 #5
    Thanks
     
  7. Feb 25, 2016 #6

    DrDu

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    Google for "lightfastness".
     
  8. Feb 25, 2016 #7

    Drakkith

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    You sure that's not a description of the speed of light? :wink:
     
  9. Feb 26, 2016 #8

    epenguin

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    And broadly pigments of plant origin will be more photosensitive and oxidisable than 'mineral'' pigments so typical Japanese woodcut print of the 19th century the colours will be faded, whilst in a Persian miniature in a book of the 15th century they will be almost like new.
     
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