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Study of silver-free photochromic glasses 10.1016/0022-3093(89 ...
May 7, 2003 . Silver-free photochromic glasses have been prepared using a conventional ceramic. . metals and so are too expensive to be used as sheet glasses. . The light source for the irradia- tion was an ultraviolet lamp (type GGU .
http://www.sciencedirect.com/science/article/pii/0022309389905140