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An insulating unit having a neutral grey color and a solar heat gain coefficient less than 0.40 includes a clear glass sheet spaced from a coated glass sheet. The coated glass sheet includes a colored glass substrate having a solar infrared reflective coating. The composition of the coated substrate

An insulating unit having a neutral grey color and a solar heat gain coefficient less than 0.40 includes a clear glass sheet spaced from a coated glass sheet. The coated glass sheet includes a colored glass substrate having a solar infrared reflective coating. The composition of the coated substrate includes a base glass portion and a glass colorant portion, the glass colorant portion including total iron in the range of 0.04 to less than 0.28 weight percent; CoO in the range of 32 to 90 parts per million, and Se in the range of greater than 0 to less than 5.5 parts per million. In one non-limiting embodiment of the invention the glass substrate at a thickness of 0.223 inches has a* chromaticity coordinates of −3.5 to +2.5 and b* chromaticity coordinates of −1 to −15, and a visible light transmittance of 40 to 80%.

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1. A glass substrate comprising a glass composition comprising a base glass portion and a glass colorant portion, wherein the base glass portion is a soda-lime-silica base portion, and the glass colorant portion comprising: total iron, expressed as Fe2O3, in the range of 0.04 to 0.28 weight percent;

1. A glass substrate comprising a glass composition comprising a base glass portion and a glass colorant portion, wherein the base glass portion is a soda-lime-silica base portion, and the glass colorant portion comprising: total iron, expressed as Fe2O3, in the range of 0.04 to 0.28 weight percent;a redox ratio in the range of 0.15 to 0.25CoO in the range of 32 to 90 parts per million;Se in the range of 1 to 5.5 parts per million;wherein a ratio of CoO to Se, each expressed in parts per million (“ppm”), is equal to or greater than 8, and the weight percents and the parts per million are based on the final glass composition, andwherein the glass composition provides a glass having chromaticity coordinates of a* in the range of −3.5 to +2.5 and b* in the range of −1 to −15 at a reference thickness of 0.223 inches (5.66 mm). 2. The glass substrate according to claim 1, wherein the glass composition provides a glass having a visible light transmittance in the range of 40 to 80% at a reference thickness of 0.223 inches (5.66 mm). 3. The glass substrate according to claim 1, wherein the glass substrate cut from a glass ribbon made by a continuous float glass process. 4. The glass substrate according to claim 1, further comprising at least one colorant selected from Cr2O3, MnO2, Nd2O3, NiO, TiO2 and Er2O3. 5. The glass substrate according to claim 1, wherein the base glass composition comprises: SiO2 65 to 75 weight percent,Na2O 10 to 20 weight percent,CaO 5 to 15 weight percent,MgO 0 to 5 weight percent,Al2O3 0 to 5 weight percent,K2O 0 to 5 weight percent, andBaO 0 to 1 weight percent. 6. The glass substrate according to claim 5, wherein: the total iron is in the range of 0.08 to 0.26 weight percent;the CoO is in the range of 35 to 60 parts per million; andthe Se is in the range of 2 to 5 parts per million. 7. The glass substrate according to claim 6, wherein the glass composition provides a glass having chromaticity coordinates of a* in the range of −3 to +1 and b* in the range of −2 to −10, and visible light transmittance in the range of 50 to 76% at a reference thickness of 0.223 inches (5.66 mm). 8. The glass substrate according to claim 5, wherein the glass colorant portion comprises: total iron in the range of 0.15 to 0.25 weight percent;CoO in the range of 37 to 50 parts per million;Se in the range of 3 to 5 parts per million. 9. The glass substrate according to claim 8, further comprising at least one colorant selected from Cr2O3, MnO2, Nd2O3, NiO, TiO2 and Er2O3. 10. The glass substrate according to claim 8, wherein the glass composition provides a glass having chromaticity coordinates of a* in the range of −2.5 to 0.0 and b* in the range of −4 to −9, and visible light transmittance in the range of 55 to 72% at a reference thickness of 0.223 inches (5.66 mm). 11. The glass substrate according to claim 8 wherein the amount of Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, wherein the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein weight percent of Fe2O3 equal to difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent is replaced by colorants according to the following formula: a mixture of Cr2O3 and CoO replaces 100 ppm Fe2O3, wherein the Cr2O3 in the mixture is in the range of 3 to 9 ppm and the CoO in the mixture is in the range of 0.2 to 0.6 ppm wherein the CoO in the glass colorant portion of the glass composition remains in the range of 37 to 50 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8 . 12. The glass substrate according to claim 8 wherein the amount of CoO is in the range of 37 ppm to a predetermined ppm, wherein the predetermined ppm is equal to or less than 50 ppm, wherein ppm equal to a difference between the predetermined ppm and the 50 ppm is replaced according to the following formula: 1 ppm of CoO is replaced with Nd2O3, wherein the Nd2O3 is in the range of 90 to 270 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8 . 13. The glass substrate according to claim 8 wherein the amount of Se and one of the other colorants of the glass colorant portion selected from the group of CoO and Fe2O3 are replaced by one of the following: A. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; CoO is in the range of 37 ppm to a predetermined ppm of CoO, and the predetermined ppm of CoO is equal to or less than 50 ppm, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the ppm of CoO equal to a difference between the predetermined ppm of CoO and 50 ppm are replaced by the following formula: a first mixture of Se and CoO is replaced by a second mixture of Er2O3 and Fe2O3, wherein the Se in the first mixture is 1 ppm, the CoO in the first mixture is in the range of 3 to 9 ppm, the Er2O3 in the second mixture is in the range of 2000 to 6000 ppm and the Fe2O3 in the second mixture is in the range of 600 to 1800 ppm, wherein the Fe2O3 in the glass colorant portion is remains in the range of 0.15 to 0.25 weight percent and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;B. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of TiO2 and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 300-900 ppm, the TiO2 in the second mixture is in the range of 800 to 2400 ppm and the CoO in the second mixture is in the range of 2 to 6 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;C. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of NiO and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 350-1050 ppm, the NiO in the second mixture is in the range of 17-42 ppm and the CoO in the second mixture is in the range of 0.5 to 1.5 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8, andD. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a mixture of Se and Fe2O3 is replaced by MnO2 wherein the Se in the mixture is 1 ppm and the Fe2O3 in the mixture is in the range of 100 to 300 ppm, and MnO2 is in the range of 500 to 1500 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 14. The glass substrate according to claim 1, wherein the glass composition provides a glass having chromaticity coordinates of a* in the range of −3 to +1 and b* in the range of −2 to −10. 15. The glass substrate according to claim 1 comprising a coating over a major surface of the glass substrate. 16. The glass substrate according to claim 1 wherein the amount of Fe2O3 is in the range of 0.04 weight percent to a predetermined weight percent of Fe2O3, wherein the predetermined weight percent of Fe2O3 is equal to or less than 0.28 weight percent, wherein weight percent of Fe2O3 equal to difference between the predetermined weight percent of Fe2O3 and 0.28 weight percent is replaced by colorants according to the following formula: a mixture of Cr2O3 and CoO replaces 100 ppm Fe2O3, wherein the Cr2O3 in the mixture is in the range of 3 to 9 ppm and the CoO in the mixture is in the range of 0.2 to 0.6 ppm wherein the CoO in the glass colorant portion of the glass composition remains in the range of 32 to 90 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 17. The glass substrate according to claim 1 wherein the amount of CoO is in the range of 32 ppm to a predetermined ppm, wherein the predetermined ppm is equal to less than 90 ppm, wherein ppm equal to a difference between the predetermined ppm and the 90 ppm is replaced according to the following formula: 1 ppm of CoO is replaced with Nd2O3, wherein the Nd2O3 is in the range of 90 to 270 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 18. The glass substrate according to claim 1 wherein the amount of Se and one of the other colorants of the glass colorant portion selected from the group of CoO and Fe2O3 are replaced by one of the following: A. Se is in the range of 1 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5.5 ppm; CoO is in the range of 32 ppm to a predetermined ppm of CoO, and the predetermined ppm of CoO is equal to or less than 90 ppm, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5.5 ppm, and the ppm of CoO equal to a difference between the predetermined ppm of CoO and 90 ppm are replaced by the following formula: a first mixture of Se and CoO is replaced by a second mixture of Er2O3 and Fe2O3, wherein the Se in the first mixture is 1 ppm, the CoO in the first mixture is in the range of 3 to 9 ppm, the Er2O3 in the second mixture is in the range of 2000 to 6000 ppm and the Fe2O3 in the second mixture is in the range of 600 to 1800 ppm, wherein the Fe2O3 in the glass colorant portion is remains in the range of 0.04 to 0.28 weight percent and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;B. Se is in the range of 1 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5.5 ppm;Fe2O3 is in the range of 0.04 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.28 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5.5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.28 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of TiO2 and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 300-900 ppm, the TiO2 in the second mixture is in the range of 800 to 2400 ppm and the CoO in the second mixture is in the range of 2 to 6 ppm, wherein the CoO in the glass colorant portion remains in the range of 32 to 90 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;C. Se is in the range of 1 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5.5 ppm;Fe2O3 is in the range of 0.04 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.28 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5.5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.28 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of NiO and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 350-1050 ppm, the NiO in the second mixture is in the range of 17-42 ppm and the CoO in the second mixture is in the range of 0.5 to 1.5 ppm, wherein the CoO in the glass colorant portion remains in the range of 32 to 90 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8, andD. Se is in the range of 1 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5.5 ppm; Fe2O3 is in the range of 0.04 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.28 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5.5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.28 weight percent are replaced by the following formula: a mixture of Se and Fe2O3 is replaced by MnO2 wherein the Se in the mixture is 1 ppm and the Fe2O3 in the mixture is in the range of 100 to 300 ppm, and MnO2 is in the range of 500 to 1500 ppm, wherein the CoO in the glass colorant portion remains in the range of 32 to 90 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 19. A glass substrate comprising a glass composition comprising a base glass portion and a glass colorant portion, the glass colorant portion having colorants in selected amounts to provide the glass substrate with chromaticity coordinates of a* in the range of −3 to +1, and a b* in the range of −2 to −10, and a visible light transmittance of 40 to 80% at a reference thickness of 0.223 inches (5.66 mm), wherein the glass colorant portion comprises: total iron in a range of 0.15 to 0.25 weight percent;CoO in a range of 37 to 50 parts per million;Se in a range of 3 to 5 parts per million;a ratio of CoO to Se is at least 8; anda redox ratio is in a range of 0.15 to 0.25. 20. The glass substrate according to claim 19, wherein the glass substrate is cut from a glass ribbon made by a continuous float glass process. 21. The glass substrate according to claim 20, wherein the glass substrate has a* chromaticity coordinates in the range of −2.5 to 0, and b* chromaticity coordinates in the range of −4 to −9, and a visible light transmittance of 55 to 72% at a reference thickness of 0.223 inches (5.66 mm). 22. The glass substrate according to claim 19, wherein the base glass composition comprises: SiO2 65 to 75 weight percent,Na2O 10 to 20 weight percent,CaO 5 to 15 weight percent,MgO 0 to 5 weight percent,Al2O3 0 to 5 weight percent,K2O 0 to 5 weight percent, andBaO 0-1 weight percent. 23. The glass substrate according to claim 22, wherein the glass substrate has a visible light transmittance of 50 to 76% at a reference thickness of 0.223 inches (5.66 mm). 24. The glass substrate according to claim 19, wherein the a* chromaticity coordinates in the range of −1.8 to −0.5 and the b* chromaticity coordinates is in the range of −5 to −8, and the visible light transmittance is in the range of 58 to 70% at the reference thickness of 0.223 inches (5.66 mm). 25. The glass substrate according to claim 19 wherein the amount of Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, wherein the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein weight percent of Fe2O3 equal to difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent is replaced by colorants according to the following formula: a mixture of Cr2O3 and CoO replaces 100 ppm Fe2O3, wherein the Cr2O3 in the mixture is in the range of 3 to 9 ppm and the CoO in the mixture is in the range of 0.2 to 0.6 ppm wherein the CoO in the glass colorant portion of the glass composition remains in the range of 37 to 50 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 26. The glass substrate according to claim 19 wherein the amount of CoO is in the range of 37 ppm to a predetermined ppm, wherein the predetermined ppm is equal to or less than 50 ppm, wherein ppm equal to a difference between the predetermined ppm and the 50 ppm is replaced according to the following formula: 1 ppm of CoO is replaced with Nd2O3, wherein the Nd2O3 is in the range of 90 to 270 ppm and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 27. The glass substrate according to claim 19 wherein the amount of Se and one of the other colorants of the glass colorant portion selected from the group of CoO and Fe2O3 are replaced by one of the following: A. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; CoO is in the range of 37 ppm to a predetermined ppm of CoO, and the predetermined ppm of CoO is equal to or less than 50 ppm, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the ppm of CoO equal to a difference between the predetermined ppm of CoO and 50 ppm are replaced by the following formula: a first mixture of Se and CoO is replaced by a second mixture of Er2O3 and Fe2O3, wherein the Se in the first mixture is 1 ppm, the CoO in the first mixture is in the range of 3 to 9 ppm, the Er2O3 in the second mixture is in the range of 2000 to 6000 ppm and the Fe2O3 in the second mixture is in the range of 600 to 1800 ppm, wherein the Fe2O3 in the glass colorant portion is remains in the range of 0.15 to 0.25 weight percent and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;B. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of TiO2 and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 300-900 ppm, the TiO2 in the second mixture is in the range of 800 to 2400 ppm and the CoO in the second mixture is in the range of 2 to 6 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8;C. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0,25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a first mixture of Se and Fe2O3 is replaced by a second mixture of NiO and CoO, wherein the Se in the first mixture is 1 ppm, the Fe2O3 in the first mixture is in the range of 350-1050 ppm, the NiO in the second mixture is in the range of 17-42 ppm and the CoO in the second mixture is in the range of 0.5 to 1.5 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8, andD. Se is in the range of 3 ppm to a predetermined ppm of Se, and the predetermined ppm of Se is equal to or less than 5 ppm; Fe2O3 is in the range of 0.15 weight percent to a predetermined weight percent of Fe2O3, and the predetermined weight percent of Fe2O3 is equal to or less than 0.25 weight percent, wherein the ppm of Se equal to a difference between the predetermined ppm of Se and 5 ppm, and the weight percent of Fe2O3 equal to a difference between the predetermined weight percent of Fe2O3 and 0.25 weight percent are replaced by the following formula: a mixture of Se and Fe2O3 is replaced by MnO2 wherein the Se in the mixture is 1 ppm and the Fe2O3 in the mixture is in the range of 100 to 300 ppm, and MnO2 is in the range of 500 to 1500 ppm, wherein the CoO in the glass colorant portion remains in the range of 37 to 50 ppm, and the ratio of CoO to Se each expressed in ppm remains equal to or greater than 8. 28. The glass substrate according to claim 19 comprising a coating over a major surface of the glass substrate.