 Posted: Apr 6, 07 Views: 712 We’ve all seen sunglasses that can change to accommodate the brightness of the surroundings, now the next generation of tint is here. Researchers at the University of Washington have invented lenses that can change multiple colors when a small electrical current is applied. The current, provided by a watch battery, switched on causes chemical reactions that change color and shade. Their inspiration? Must have been the blazing hot and sunny days of Washington State.  You can adjust the variation of darkness and control the transparency of your lens," said Minoru Taya, professor of mechanical engineering at the University of Washington. Taya developed the lenses with research assistant professor Chunye Xu and doctoral student Chao Ma...
Unlike other so-called electrochromic materials, this polymer is made from cheaper organic chemicals — as opposed to more expensive inorganic chemicals. And it's able to change from a clear to colored state in one to two seconds, while maintaining the state without a constant injection of power. This could ultimately make the lenses more economical to manufacture and power, said Taya.
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