TINTED GRAY SODIUM-LIME GLASS AND VITRIFIABLE COMPOSITION

摘要

In the present invention there is disclosed soda-lime glass with a clear gray tint, and with a shade varying between greenish and bluish containing as coloring agents 0.25 to 0.60 percent by weight of Fei2Oi3, 0.0010 to 0.0040 percent by weight of Co and 0.0005 to 0.0030 percent by weight of Se. An excitation purity of less than 6 percent and a selectivity of more than 1.1 characterizes this glass.