Glass comprises essentially 20-70% SiO2, 10-50% TiO2+Nb2O5+SnO2+Ta2O5+WO3+CeO2, 0-50% MgO+CaO+SrO+BaO+ZnO, and 0-30% B2O3+Al2O3, in molar percentage terms based on the oxides; and has a resistivity of at most 1015 cm at 20 C. A method for production of glass is to produce the glass under such a condition that a redox represented by [Fe2+]/([Fe2+]+[Fe3+]) where Fe is present in the glass, is at least 0.6.

 
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