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US4331769A Tinted spontaneous opal glass 失效
有色自发蛋白石玻璃

Tinted spontaneous opal glass
摘要:
The instant invention is concerned with the production of spontaneous opal glasses exhibiting tints ranging from ivory-through-beige-through-tan-to-brown, depending upon the shade sought, and demonstrating a Fe.sup.+3 reading between about 6.5-9 consisting essentially, expressed in weight percent on the oxide basis, of about______________________________________ SiO.sub.2 64.5 .+-. 2.0 Al.sub.2 O.sub.3 6.25 .+-. 0.5 Na.sub.2 O 3.0 .+-. 0.5 K.sub.2 O 3.0 .+-. 0.5 MgO 1.25 .+-. 0.3 B.sub.2 O.sub.3 4.5 .+-. 0.7 F 3.25 .+-. 0.5 CaO 14.5 .+-. 1.0 NiO 0.02 - 1.0 ______________________________________
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