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Uranium glass is glass which has had uranium, usually in oxide diuranate form, added to a glass mix before melting for coloration. The proportion usually varies from trace levels to about 2% by weight uranium, although some 20th-century pieces were made with up to 25% uranium.〔Big Book of Vaseline Glass, by Barrie Skelcher, Pub. Schiffer〕〔("Vaseline and uranium glass ca. 1930s" )〕 Uranium glass was once made into tableware and household items, but fell out of widespread use when the availability of uranium to most industries was sharply curtailed during the Cold War in the 1940s to 1990s. Most such objects are now considered antiques or retro-era collectibles, although there has been a minor revival in art glassware. Otherwise, modern uranium glass is now mainly limited to small objects like beads or marbles as scientific or decorative novelties. ==Appearance== The normal colour of uranium glass ranges from yellow to green depending on the oxidation state and concentration of the metal ions, although this may be altered by the addition of other elements as glass colorants. Uranium glass also fluoresces bright green under ultraviolet light and can register above background radiation on a sufficiently sensitive Geiger counter, although most pieces of uranium glass are considered to be harmless and only negligibly radioactive. File:Uranium glass beads, white background.jpg|Modern uranium glass beads (white background) File:Uranium glass beads, black background.jpg|Modern uranium glass beads (black background) File:Uranium glass beads, UV light.jpg|Modern uranium glass beads (UV light) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Uranium glass」の詳細全文を読む スポンサード リンク
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