DNN Expert posted on February 28, 2011 21:20

Vincent Van Gogh's paintings of sunflowers, made in the late 1880s, are widely known for their vibrant yellow color — Van Gogh used a new kind of paint, "chrome yellow,” to achieve that now-iconic vibrancy. Unfortunately, curators around the world have watched in mystified dismay as that vivid yellow has faded to a muddy brown ...
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