The films created by Shen et al. are colored, but it is structural color in the form of nanocrystals, not due to adding pigments or dyes. So color can be added without sacrificing the passive ...

INDIANAPOLIS, March 26, 2023 — The cold blast of an air conditioner can be a welcome relief as temperatures soar, but “A/C” units require large amounts of energy and can leak potent greenhouse gases.