Xiulin Ruan, a Purdue University professor of mechanical engineering, holds up his lab's sample of the whitest paint on record.
Jared Pike—Purdue University
These are independent reviews of the products mentioned, but TIME receives a commission when purchases are made through affiliate links at no additional cost to the purchaser.

When the sun shines on a typical white building, the exterior’s paint reflects 80 to 90% of the light. The remainder warms the surrounding area and inflates air-conditioning bills. But a new, whiter paint incorporates chemicals that better scatter UV rays, making it up to 98% reflective and potentially reducing AC needs by as much as 40%. “The heat is reflected into deep space,” says Xiulin Ruan, a professor of mechanical engineering who led the Purdue University team that created the paint. “You keep our cities cooler.” In fall 2022, the team announced the development of a thinner, lighter version that could coat airplanes, cars, and even spaceships.

More Must-Reads From TIME

Contact us at letters@time.com.

Hydration Made Fun
A Modern Flip Phone
A Saliva Pregnancy Test
More Than a Fast Car
A Breakthrough Bassinet
EDIT POST