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  1. #1
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    Prussian Blue "restored" after fading in LF test?

    I'm currently testing several watercolors for lightfastness.
    Somewhere someone said that Prussian Blue would first fade, and then restore back in strength, and so far they were right.
    But does anyone know if it's only under certain conditions it fades/restores and what exactly is going on with that pigment since it does that?
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