https://youtu.be/-qyE-fHPZYk

Barium sulfate white paint absorbs only 1% of heat from 

the sunlight. 

https://www.purdue.edu/newsroom/releases/2021/Q2/the-whitest-paint-is-here-and-its-the-coolest.-literally..html

Xiulin Ruan, a Purdue University professor of mechanical engineering, holds up his lab’s sample of the whitest paint on record. (Purdue University/Jared Pike) 

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New paint formulation could help buildings rely less on air conditioning

WEST LAFAYETTE, Ind. — In an effort to curb global warming, Purdue University engineers have created the whitest paint yet. Coating buildings with this paint may one day cool them off enough to reduce the need for air conditioning, the researchers say.