NOVELTY - The continuous melting process comprises charging a first powdery material to obtain a glass bath by fusion, refining and then cooling the material, and bubbling an oxidant gas in the glass bath. The bubbles created during the bubbling of the oxidant gas have a diameter of 1-2 cm. The quantity of total oxygen introduced in the glass bath is 0.1-5 l/kg of glass. The oxidant gas is bubbled through a perforated metal part having several holes, and through a porous refractory ceramic part. The glass has a viscosity of 300-600 Pas during bubbling, and redox of 0.08-0.05.    USE - The process is useful for continuous melting of glass precursor, which is useful to form a silico-sodo-calcic glass substrate or a colorless lithium aluminosilicate type vitroceramic, where the silico-sodo-calcic glass substrate is useful in a photovoltaic cell, a solar cell, a parabolic mirror for the concentration of solar energy or diffusers for backlight display screen type LCD and the vitroceramic glass substrate is useful as cooking plate for covering the heat elements or as chimney insert (all claimed).    ADVANTAGE - The process is capable of uniformly, continuously, simply and effectively processing the glass precursor thus providing the glass with improved roughness, optical property and high quality, and avoids any stress to the glass substrate thus improving the performance of the solar cell.    DETAILED DESCRIPTION - The continuous melting process comprises charging a first powdery material to obtain a glass bath by fusion, refining and then cooling the material, and bubbling an oxidant gas in the glass bath. The bubbles created during the bubbling of the oxidant gas have a diameter of 1-2 cm. The quantity of total oxygen introduced in the glass bath is 0.1-5 l/kg of glass. The oxidant gas is bubbled through a perforated metal part having several holes, and through a porous refractory ceramic part. The glass has a viscosity of 300-600 Pas during bubbling, and redox of 0.08-0.05. A reducer associated with a sulfate is added to the powdery material. An INDEPENDENT CLAIM is included for a silico-sodo-calcic glass substrate or a colorless lithium aluminosilicate type vitroceramic.