Patent ID: 7538054

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 0-5% BaO 0-1% and a colorant portion consisting essentially of: Ingredient wt. % total iron: 0.20-0.80% erbium oxide: 0.01-1.0% neodymium oxide: 0.001-1.0% praseodymium oxide: 0.001-1.0% nickel oxide: 0 to 0.5% selenium: 0.0-0.03% cobalt oxide: 0.001-0.2% wherein the grey glass has a dominant wavelength in the range of from 435 nm to 570 nm.