Ultramarine Blue and Acid

  • Egg Tempera

    Ultramarine Blue and Acid

    Posted by Koo on April 21, 2021 at 4:50 am

    Hi George,

    I’ve always heard that ultramarine blue is susceptible to acids, so I warned against using acidic substances as preservatives in egg yolk medium. However, reading your post on Ultramarine Blue, it says ultramarine is susceptible to mineral acids. Is it correct to say that organic acids do not affect ultramarine, only inorganic acids do?

    Thanks, Koo

    Mark replied 1 year, 9 months ago 2 Members · 1 Reply
  • 1 Reply

  • Mark

    Member
    July 30, 2022 at 7:20 am

    thats so useful thank you sir!

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