30 cm containing 60 of aluminum and 40 of magnesium and having a melting point of 460 u00b0 c and a boiling point above 1100 u00b0 c was placed over said molten glass the temperature gradient into said liquid layer cause a diffusibility of the materials phenomena known as 34 soret effect 34 by which a natural stratification of densities is produced into said layer such densities varying in a range of 2 27 to 1 97 gr cm 3 and consequently said liquid layer floats over the melted glass then a bait is introduced into the glass adhering it in order to allow a continuous vertical withdrawing through said stratified liquid layer floating over the glass in this way an extremely flat glass sheet having an even thickness and a surface free of any metallic film from the liquid layer is obtained to avoid oxidation and combustion into said stratified liquid layer floating over the glass a protective inert atmosphere such as those of argon or nitrogen may be used on a molten glass of similar composition as in example 1 three liquid layers were placed as following over said molten glass a liquid layer of 10 cm thick having a composition of 70 of aluminum and 30 of magnesium a melting point of 490 u00b0 c and a boiling point above of 1100 u00b0 c was placed the density of this alloy varies from 2 12 to 2 04 gr cm 3 in the temperature range of 750 u00b0 to 1100 u00b0 c over the former liquid layer a second liquid layer of 10 cm thick having a composition of 73 of calcium and.