You don’t need to be a watchnerd for a glow-in-the-dark watch dial to elicit a childlike sense of delight. But watchnerds are especially into their watch ‘lume.’ That’s the term they use for the luminescent material that keeps their watches legible in the dark, and it’s all but essential to any sport watch. There’s some interesting science behind it, different methods of illuminating a dial — and some surprising history. The History of Watch Lume

In the 1910s and
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