Tunable transparency smart glass has been developed.

Scientists have developed a kind of "smart glass" which can become transparent from opaque like chameleons, and can be adjusted according to different wavelengths. But now there is a kind of glass that can change from opaque to transparent like chameleons, and can be adjusted according to different light waves. It can improve the energy efficiency of buildings through large glass windows, freeing homeowners from the chore of curtains.

This glass is the result of research by scientists at Lawrence Berkeley National Laboratory and Autonomous University of Barcelona. It is made of niobate and mixed with indium tin oxide (ITO) crystals at the nanoscale. This mixed material is called glass because it has the characteristics of glass: all the molecules are very chaotic, just like liquids without a clear pattern. Ordinary window glass is made of silica mixed with other materials, such as sodium oxide, magnesium oxide, calcium oxide, etc.