The blue pigment Mayans used to paint temple walls 1, 400 years ago was made of particles only about 50 nanometers across.
FORBES: The Science of Small
The new work was begun during a conservation treatment in 2009, when conservators found that the yellows in Flowers In A Blue Vase - this time from a pigment called cadmium yellow - had turned greyish and cracked.
BBC: Van Gogh's Flowers In A Blue Vase damage seen in X-rays
The mutation that causes blue eyes reduces the expression of OCA2 and hence reduces pigment concentration.
WSJ: Matt Ridley on Human Culture's Effect on Genes | Mind & Matter
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