A method is provided for making clear glass having an azure edge coloration and
low amber surface coloration in a non-vacuum float glass system. The method includes
processing batch materials in a non-vacuum float glass system to provide a final
glass product including:
SiO2
65-75 wt. %;
Na2O
10-20 wt. %;
CaO
5-15 wt. %;
MgO
0-5 wt. %;
Al2O3
0-5 wt. %;
K2O
0-5 wt. %;
- a colorant portion having total iron (Fe2O3) of
0-0.02 wt. %, CoO of 0-5 ppm, Nd2O3 of 0-0.1 wt. %, and CuO
of 0-0.03 wt. %. The glass has a redox ratio in the range of 0.2 to 0.6, and can
have a retained sulfur content of less than or equal to 0.2 wt. %, such as less
than or equal to 0.11 wt. %.
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