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photochromism |
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photochromism [¦fōd·ō′krō‚miz·əm] (chemistry) The ability of a chemically treated plastic or other transparent material to darken reversibly in strong light. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Special-effects colorants include granites for olefins and FDA-approved Granite Black MPC; photochromic dyes for plastics and ophthalmic lenses; and phosphorescent pigments for glow-in-the-dark effects. Photochromic lenses (the ones that darken or lighten depending on the ambient light) are good if you run in and out of shady and sunny areas. Yet there will be sustainable innovations in building: photochromic glass for example will soon perhaps be cheap enough to use on a large scale; electrochromic glass[10] is very expensive now, but will presumably become cheaper. |
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