Chromium bearing forehearth color concentrate

A forehearth color concentrate comprising a non-smelted agglomerated interspersion of particles for use in coloring glass, said concentrate comprising by weight from about 50% to about 95% of a glass component and from about 4% to about 50% of a binder, said glass component comprising a glass frit comprising by weight from about 8% to about 22% Na2O, from about 30% to about 45% SiO2, from about 4% to about 18% B2O3, from about 1% to about 9% K2O, from about 0% to about 2% Li2O, from about 0% to about 1% Al2O3, from about 0% to about 5% CaO, from about 0% to about 3% TiO2, from about 0% to about 1% F2, up to about 20% coloring oxides, and from about 17% to about 33% chromium oxide.

A color concentrate glass frit for use in for use in either forming a non-smelted agglomerated interspersion of particles for use as a forehearth color concentrate or for use as a direct addition to the forehearth of a glass furnace, said glass frit comprising by weight from about 8% to about 22% Na2O, from about 15% to about 60% SiO2, from about 0% to about 25% B2O3, from about 0% to about 25% K2O, from about 0% to about 3% Li2O, from about 0% to about 2% Al2O3, from about 0% to about 15% CaO, from about 0% to about 5% TiO2, from about 0% to about 1% F2, and from about 15% to about 35% chromium oxide.

A color concentrate glass frit for use in for use in either forming a non-smelted agglomerated interspersion of particles for use as a forehearth color concentrate or for use as a direct addition to the forehearth of a glass furnace, said glass frit comprising by weight from about 8% to about 22% Na2O, from about 30% to about 45% SiO2, from about 4% to about 18% B2O3, from about 1% to about 9% K2O, from about 0% to about 2% Li2O, from about 0% to about 1% Al2O3, from about 0% to about 5% CaO, from about 0% to about 3% TiO2, from about 0% to about 1% F2, up to about 5% coloring oxides, and from about 17% to about 33% chromium oxide.