Patent ID: 8669197

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 ) 0.20 to 0.35% selenium 0.0002 to 0.0020% cobalt oxide 0.0025 to 0.0060% titanium oxide less than 0.60% wherein the grey glass contains titanium oxide and has a redox value (FeO/Fe 2 O 3 ) of no greater than 0.27, a visible transmittance (Lta) of from 59-66%, a dominant wavelength in the range of from 470 nm to 555 nm, and an excitation purity (Pe) of no greater than 5.0%.