Patent ID: 7902097

Claim:
A neutral gray colored glass composition having a base portion of a soda-lime-silica composition comprising: SiO 2 from 68 to 75%; Al 2 O 3 from 0 to 5%; CaO from 5 to 15%; MgO from 0 to 10%; Na 2 O from 10 to 18%; K 2 O from 0 to 5%; SO 3 from 0.05 to 0.30% and major colorants comprising: Fe 2 O 3 from 0.30 to 0.70 weight percent; Co 3 O 4 from 0 to 30 ppm; Se from 1 to 20 ppm; CuO from 20 to 200 ppm wherein the glass has an illuminant “A” light transmission greater of 65%, a total solar energy transmittance than less than or equal to 60%, a solar ultraviolet transmittance of less than 46%; a dominant wavelength from 490 nm to 600; and an excitation purity of less than 6.