Researchers create switchable mirrors from liquid metal.

Precursor to ColorFilters Chameleonic camouflage and or Electronic Invisibility coats?

Researchers have developed a way to dynamically switch the surface of liquidmetal between reflective and scattering states. This technology could one day be used to create electrically controllable mirrors or illumination devices.

— Read on phys.org/news/2021-06-switchable-mirrors-liquid-metal.html