Henry Rzepa's Blog Chemistry with a twist

March 5, 2011

Lapis lazuli: the colour of ultramarine.

My colleague Bill Griffith has again come up with another colour challenge: that of the ancient semi-precious stone Lapis Lazuli, mined in the mountains of Afghanistan for more than 6000 years and used by painters in some medieval paintings of the Virgin, the Wilton diptych etc.

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