SSS 2012-08-22

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Camouflage¹ face paint can make a soldier invisible to enemy in eyes. But it won't shield him from the shearing² heat of a roadside bomb, a lethal³ eleven hundred degrees Fahrenheit⁴. And the greases and oils in the makeup⁵ just add fuel to the fire, essentially⁶ cooking the soldier's face. But researchers have come up with a safer, heat-blocking alternative, presented in this week at a meeting of the American Chemical Society. 

 

Conventional camo paint has tiny nano particles of pigment⁷, they are great at reflecting visible light which is why the paint looks green or black or tan. But the particles don't reflect longer wavelengths⁸ like heat. To do that, you need larger globs of pigment. So researchers bundled together a bunch of those smaller particles into chunks⁹ the size of grains of sand, large enough for heat rays to bounce right off. And it swapped¹⁰ out the grease for silicone which adds smoothest and spreadability to cosmetics¹¹, but won't catch fire. Under a blowtorch, the new camo paint can block out heat for fifteen seconds, long enough to weather a bomb blast and keep soldiers cool in the heat battle. 

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