The Washington PostDemocracy Dies in Darkness

Researchers say cool white paint could combat urban heat

How white is their paint? Whiter than virgin snow, they say.

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April 16, 2021 at 6:00 a.m. EDT
Xiulin Ruan, a Purdue University professor of mechanical engineering, displays his lab’s sample of the whitest paint on record. (Jared Pike/Purdue University)

A quest going back decades to find the ultimate cool white has led to the creation of a paint that researchers say reflects up to 98.1 percent of sunlight and sends infrared heat away from a surface, making it cooler than the surrounding air.

Covering buildings with the new paint, which is headed to the commercial market in the next two years, could reduce the need for air conditioning, decrease the use of fossil fuels and help combat the problem of urban heat islands, an increasing health concern as temperatures rise, according to researchers at Purdue University.