Patent ID: 7625830

Claim:
A blue glass composition, comprising: a base portion comprising: SiO 2 65 to 75 weight percent, Na 2 O 10 to 20 weight percent, CaO 5 to 15 weight percent, MgO 0 to 5 weight percent, Al 2 O 3 0 to 5 weight percent, K 2 O 0 to 5 weight percent, and a major colorant portion comprising: Fe 2 O 3 (total iron) 0.1 to 0.9 weight percent, and a combination of Er 2 O 3 0.1 to 3 weight percent and Nd 2 O 3 0.1 to 3 weight percent, wherein the glass is characterized by a dominant wavelength in the range of 480 nm to 495 nm and a light to solar gain ratio in the range of 0.9 to 1.5 at least one thickness in the range of 4 mm to 6 mm wherein the glass is essentially free of cobalt and/or selenium.