Abstract: A glass composition has a base and a colorant. The composition of the base is 68 to 75% SiO2, 10 to 18 wt. % Na2O, 5 to 15 wt. % CaO, 0 to 10 wt. % MgO, 0 to 5 wt. % Al2O3, and 0 to 5 wt. % K2O, where CaO+MgO is 6 to 15 wt. % and Na2O+K2O is 10 to 20 wt. % is provided. The composition of the colorants comprises 0.22 to 0.36 wt. % Fe2O3, 0.10-0.18 wt. % FeO, 0.1 to 0.5 wt. % MnO2, 1.5 to 13 ppm selenium, and 0 to 15 ppm Cobalt. A redox ratio of the weight of FeO to the total weight of iron is in a range of about 0.35 to up to less than about 0.60. The glass has spectral properties at a control thickness of 4.0 mm of 74 -77% transmittance using illuminant A, 57-65% ultraviolet transmittance, 30-46% infrared transmittance and 50-61 % total solar energy transmittance. The color of glass of the invention using illuminant C with a 2° observer is a parallelogram bounded by the following x and y chromaticity coordinates: (0.304, 0.314); (0.3075, 0.3205); (0.3065, 0.323); and (0.303, 0.317).

Abstract: A glass composition has a base and a colorant. The composition of the base is 68 to 75% SiO2, 10 to 18 wt. % Na2O, 5 to 15 wt. % CaO, 0 to 10 wt. % MgO, 0 to 5 wt. % Al2O3, and 0 to 5 wt. % K2O, where CaO+MgO is 6 to 15 wt. % and Na2O+K2O is 10 to 20 wt. % is provided. The composition of the colorants comprises 0.4 to 0.6 wt. % Fe2O3, 0.18 to 0.28 wt. % FeO, 0.05 to 0.3 wt. % MnO2, and 0 to 8 ppm Cobalt. The redox ratio of the weight of FeO to the total weight of iron is in a range of about 0.40 to about 0.58. The colored glass has an aqua color with a dominant wavelength of 489.2 nm +/?1.2 nm, an excitation purity of 7% +/?1%, and an infrared transmittance in the range of 16% to 29% at 4.0 mm thickness.

Abstract: A blue glass composition comprises a soda-lime-silica base and a colorant portion consisting essentially of about 0.4 to 0.65 weight percent total iron oxide, about 0.1 to 0.3 weight percent manganese oxide, and cobalt oxide in an amount effective to produce a cobalt concentration of about 0.0002 to 0.0013 weight percent (about 2 to 13 ppm). The glass is characterized by a ratio of ferrous oxide to total iron oxide between about 0.43 and 0.58. The glass composition exhibits a combination of high visible transmittance, high infrared absorption and enhanced blue coloration. This is attributed in large part to the combination of ferrous oxide and cobalt oxide and to the effect of manganese oxide in reducing iron sulfide formation and thereby avoiding amber coloration.