Warm Reflections: Window tint kicks in when it's hot

12:17pm, August 18, 2004

Some window coatings reflect heat. Unfortunately, they also keep out the sun's warmth when outside temperatures are chilly. Now, chemists in England have created a window coating that automatically transforms into a heat mirror only when warmed above room temperature. The material is made of vanadium dioxide imbued with traces of tungsten.

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