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ASTM Lightfastness Testing for Oil Paints

9 thoughts on “ASTM Lightfastness Testing for Oil Paints”

  1. Outstanding work guys!! An awful lot to digest here and confusing in some ways (as anything to do with lightfastness is!).

    Thank you so much!

  2. Wow! What amazing, groundbreaking work — it will change the way artists, educators, and conservators think about paint. (As an artist it is certainly shifting the way I think about paint). These are fascinating insights on the performance of Ultramarine, Pyrrole, and Green Gold.

    Information on the performance of pigments in various whites and binding oils helps a lot to inform artistic decisions.

    The paintings which we spend so much time making will now last longer thanks to your work.

    Thank you for leading the way on lightfastness!

  3. I am only coming to this article now and just wanted to say how proud I am of the continuing work you have done on these issues – you have taken it to a level and breadth I could only have dreamt of. Congratulations on the testing and compiling of such amazing and groundbreaking work. Truly – Sarah Sands

  4. Thanks so much for the hard work! The team at Golden is the best! Could some of the pigments that performed less than excellent when mixed with flake white, such as Lightfastness II and in some cases worse (Green Gold), perform better if kept closer to the mid-tone to darker values? I am also a little confused as to why Indanthrone Blue flake tint performed at a lightfastness II on the first chart but on the flake white reactivity chart, Indanthrone Blue performed at a lightfastness I?

    • Thanks for the compliments and questions!
      Yes, I think it is possible that darker-value tints with Flake White could be more lightfast than lighter-value tints. As part of our follow-up work, we will be testing some color/white combinations at multiple concentrations. We’ll also test these combinations using each of the exposure methods we used for the current work, since Flake White’s performance was highly dependent on exposure method.
      I can’t give you a definitive answer about the disagreement of the Indanthrone Blue results, since there are a few possible explanations. The Flake White reactivity testing did not include all of the exposure methods and did not use the same samples or the same color:white ratios. In that section, all of the tints were made by using set ratios of color:white, and only tested using the xenon chamber. Any of these differences may have caused the discrepancy. Hopefully after some more testing we can provide a more definitive answer!


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