Ancient Egyptian pigment may find use on power-saving roofs

Previous research has already shown that surfaces coated with Egyptian blue absorb incoming visible light and emit it as near-infrared light.

In a recent study, though, scientists at Lawrence Berkeley National Laboratory found that the fluorescent effect is 10 times stronger than originally thought. In fact, the pigment emits almost 100 percent as many photons as it absorbs, doing so at an energy efficiency rate of up to 70 percent – infrared photons don’t carry as much energy as visible-light photons.

Ben Coxworth

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