'Photochromic glass used in eyeglasses does this when exposed to sunlight'
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GLASS & GLASSMAKING: Photochromic glass used in eyeglasses does this when exposed to sunlight
Photochromic glass used in eyeglasses does this when exposed to sunlight
Photochromic glass used in eyeglasses does this when exposed to sunlight
GLASS & GLASSMAKING
darken
GLASS & GLASSMAKING