Scott Alexander at Astral Codex Ten:
In Ballad of the White Horse, G.K. Chesterton describes the Virgin Mary:
Her face was like an open word
When brave men speak and choose,
The very colours of her coat
Were better than good news.
Why the colors of her coat?
The medievals took their dyes very seriously. This was before modern chemistry, so you had to try hard if you wanted good colors. Try hard they did; they famously used literal gold, hammered into ultrathin sheets, to make golden highlights.
Blue was another tough one. You could do mediocre, half-faded blues with azurite. But if you wanted perfect blue, the color of the heavens on a clear evening, you needed ultramarine.
Here is the process for getting ultramarine. First, go to Afghanistan. Keep in mind, you start in England or France or wherever. Afghanistan is four thousand miles away. Your path takes you through tall mountains, burning deserts, and several dozen Muslim countries that are still pissed about the whole Crusades thing. Still alive? Climb 7,000 feet through the mountains of Kuran Wa Munjan…
More here.
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