초록 ▼

A glass composition employing as its colorant portion at least iron (total iron expressed as Fe2O3), erbium (e.g., Er2O3), and holmium (e.g., Ho2O3). The glass may be grey or otherwise colored in different embodiments. In certain example embodiments the colorant portion may include, by weight percen

A glass composition employing as its colorant portion at least iron (total iron expressed as Fe2O3), erbium (e.g., Er2O3), and holmium (e.g., Ho2O3). The glass may be grey or otherwise colored in different embodiments. In certain example embodiments the colorant portion may include, by weight percentage:Ingredientwt. %total iron:0.10-0.90%erbium oxide:0.20-2.50%selenium: .ensp.0.0-0.0020%cobalt oxide: .ensp.0.0-0.0050%titanium oxide:0.0-2.0%boron oxide:0.0-2.0%holmium oxide:0.10-1.60%thulium oxide:0.0-2.0%ytterbium oxide:0.0-3.0%lutetium oxide: 0.0-1.0%.

대표청구항 ▼

1. A glass comprising:the glass formed so as to have a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than about 4.5%; wherein a colorant portion of the grey glass comprises iron oxide and at least three different lanthanide oxides, where a sum

1. A glass comprising:the glass formed so as to have a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than about 4.5%; wherein a colorant portion of the grey glass comprises iron oxide and at least three different lanthanide oxides, where a sum total of all of the lanthanide oxides in the glass is from 1.0 to 5.0%, by weight; and wherein the at least three different lanthanide oxides include at least erbium oxide and holmium oxide, and wherein the colorant portion includes from about 0.10 to 2.0% total iron oxide.