Ultramarine blue, or "true blue," was once more valuable than gold. In 1824, a synthetic version called French ultramarine made the color more accessible. But ultramarine blue made from real lapis lazuli can sell for over $60 an ounce today.
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Purdue University engineers are winners of the 2023 Gizmodo Science Fair for making the world’s whitest paints.
It’s common sense: When it’s hot outside, don’t put on a dark shirt—wear white instead.