Butterfly-inspired films create vibrant colors while passively cooling objects

https://phys.org/news/2023-08-butterfly-inspired-vibrant-passively-cooling.html

"doesn't absorb light... buildings, vehicles, equipment, clothes preserve high color saturation, brightness... lowers temperature 2°C (blue by 26°C), annual energy savings 1,377 MJ/m2/ yr... disordered rough frosted glass under multilayer titanium dioxide and aluminum dioxide placed on silver (cheaper aluminum enables electron beam evaporation and magnetron sputtering) layer... reflect yellow light in very narrow range of angles while disordered structure diffuses blue... >15 ℃ cooler (winter) >35°C cooler (summer)"

Related: A sustainable alternative to air conditioning
https://www.sciencedaily.com/releases/2023/10/231030110826.htm