Colorful films could help buildings, cars keep their cool

https://techxplore.com/news/2023-03-cars-cool.html

"plant-based film that gets cooler when exposed to sunlight without requiring external power... various textures and bright, iridescent colors... without having to be white or mirrored... cellulose nanocrystals (CNCs) derived from plant cellulose made into iridescent, colorful films without added pigment... brittle CNC films plasma-treated to adhere to ethyl cellulose... under sunlight an average 40°F cooler than surrounding air... square meter generated >120 W cooling power similar to residential air conditioners"

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Scientists develop nanocellulose-based aerogel film to keep buildings cooler

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