Abstract: An infrared energy and ultraviolet radiation absorbing green-colored high total iron containing soda-lime-silica glass batch includes typical soda-lime-silica glass batch ingredients, an ultraviolet radiation absorbing quantity of a cerium containing compound, a high amount of total iron, and a surprisingly small amount of carbon which eliminates silica scum formation in the melt and silica inclusion faults in the finished glass.

Abstract: The superstructure of a float chamber containing a bath of molten metal and having a confined atmosphere is purged of metal condensates adhering thereto on controlled occasions to produce a glass ribbon substantially free of "top speck" defects. Minute molten metal deposits condensing on the superstructure of the chamber are removed therefrom at brief and infrequent time intervals by introducing a fluxing agent such as a halogen or halide into the confined atmosphere causing the minute molten metal deposits to coalesce and drop from the superstructure onto the glass ribbon and/or the molten metal bath at the controlled occasions.