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Photochromatic glass

Photochromatic glass, also known as smart glass is a material whose optical properties can be altered electrically. In the most common variation, a pane of glass is normally translucent, but when voltage is present between its surfaces, it becomes transparent. A less common type is opaque until energized.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Photochromatic_glass". A list of authors is available in Wikipedia.
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