Patent ID: 7033967

Claim:
A colored soda-lime glass of blue hue composed of glass-forming main constituents, comprising more than 2% of magnesium oxide and coloring agents, characterized in that it contains (a) 1.2 wt % or more of Fe 2 O 3 ; (b) less than 0.53 wt % FeO; and (c) less than 0.13 wt % manganese oxide; and has (d) a light transmission (TLA4) of between 15% and 70%; (e) a selectivity (SE4) of greater than 1.2; (f) a dominant wavelength (λ D ) and an excitation purity (P) such that they lie in a CIE 1931 chromaticity plot within a triangle whose apices are defined by the point representing the Illuminant C source and the points whose coordinates (λ D ,P) are (490,19) and (476,49), respectively; and (g) a purity P of more than 12%.