Patent ID: 7622410

Claim:
A grey glass comprising: a base glass portion comprising: Ingredient wt. % SiO 2 67-75% Na 2 O 10-20% CaO 5-15% MgO 0-7% Al 2 O 3 0-7% K 2 O 0-7% and a colorant portion consisting essentially of: total iron (expressed as Fe 2 O 3 ) 0.15 to 0.45% selenium <=3 ppm chromium oxide 1-20 ppm cobalt oxide 130-240 ppm nickel oxide 500-1,000 ppm titanium oxide 0 to 0.20% wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of from about 0.20 to 0.40, a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm; wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and wherein the grey glass includes erbium oxide from 0.1 to 0.8%.