Patent ID: 7659221

Claim:
A method for forming a colored glass article in a single heating step, comprising the steps of: providing a glass batch composition comprising a base glass portion comprising: SiO 2 66 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 BaO 0 to 1 weight percent Bi 2 O 3 0 to 5 weight percent total iron (Fe 2 O 3 ) to provide a redox ratio of >0.35; providing a colorant portion comprising precursor materials for at least one of Cu nanostructures, Au nanostructures, or Ag nanostructures, wherein the Cu nanostructures precursor is selected from the group consisting of copper containing sulfates, copper containing nitrates, and copper containing oxides; the Au nanostructures precursor is selected from the group consisting of hydrogen tetrachloreaurate (III) tri-hydrate (HAuCl 4 .3H 2 O), gold (III) chloride, gold (III) oxide, sodium aurothiomalate hydrate, and gold (III) hydroxide; and the Ag nanostructures precursor is selected from the group consisting of silver nitrate (AgNO 3 ), silver chloride, silver oxide, silver acetate, silver perchlorate, and silver acetylacetonate; heating the glass batch composition and colorant portion in a single heating step to form molten glass of a desired color having at least one of 0.0001 to 0.15 weight percent of Cu nanostructures, <0.01 weight percent of Au nanostructures, or <0.01 weight percent of Ag nanostructures; depositing the molten glass on a bath of molten tin to form a glass ribbon of the desired color; and removing the glass ribbon from the molten tin bath to form glass sheets of the desired color.