The invention relates to a glass composition of silica-soda-lime type colored blue which comprises the coloring agents below in a content varying within the following limits, by weight: Fe2O3 (total iron)0.2 to 0.51% CoO10 to 50ppm Cr2O310 to 300ppm CuO0-400ppm the glass exhibiting a redox factor of less than 0.35, a dominant wavelength λD of between 485 and 489 nm, an excitation purity of less than 13% and a selectivity at least equal to 1.1 under a thickness of between 3 and 5 mm. It also relates to the glass sheet obtained from the abovementioned composition, said sheet being intended in particular to form an automobile window or for the construction industry.