Abstract: A method of making a glass product includes the steps of: melting a batch of a plurality of glass raw materials in a melting tank to form a glass melt; heating at least one of the plurality of glass raw materials and the glass melt using at least one fuel burner by reacting hydrogen and oxygen; withdrawing the glass melt from the melting tank; obtaining a glass product, the glass product having an Fe2+ to Fe3+ ratio of less than 0.2 or less than 0.05 and having at least one of less than 80 bubbles in a size range of from 0.1 mm to 0.2 mm per 10 kg of glass and less than 2 bubbles of a size larger than 0.2 mm per 10 kg of a glass.

Abstract: A method to produce a clear glass or a clear drawn glass includes the steps of melting starting materials to obtain a glass batch melt, refining the obtained glass batch melt, homogenizing the obtained glass batch melt, and producing a glass product in the drawing process. A sulfate refining agent, selected from an alkali-, alkaline earth- or zinc sulfate or mixtures thereof is utilized in a predetermined amount and a predefined refining temperature during refining of the glass batch melt which is 0° C. to 100° C. higher than that in a refining process using a refining system which contains antimony oxide on its own or in combination with one or several other refining agents.