The transition temperature can be tuned with dopants[0]. And the switching happens from transparent at low temperatures to reflective at higher temperatures. T

The transition temperature can be tuned with dopants[0]. And the switching happens from transparent at low temperatures to reflective at higher temperatures. That said, its highest transmittance is in the infrared, it's not that great in the visible spectrum. [0] https://dr.ntu.edu.sg/bitstream/handle/10220/25845/for-your-whale-tank.pdf?sequence=1&isAllowed=y https://dr.ntu.edu.sg/bitstream/handle/10220/25845/for-your-...