Composition of silico-soda-lime, characterized gray glass that it is constituted by a glass matrix comprising the following constituents (by weight percent): SiO2 64-75% Al2O3 0-5% B2O3 0-5% CaO 5-15% MgO 0 - 10% Na2O 10-18% K2O 0-5% BaO 0-5%, and comprising the coloring agents below in a content ranging between the following weight limits: Fe2O3 (total iron) 0.01 to 0, 14% CoO 40-150 ppm NiO 200 to 700 ppm weight ratio being comprised NiO / CoO between 3.5 and 6, and wherein the glass global light transmission under illuminant D65 (TLD65) between 20 and 60% measured for a thickness of 6 mm.
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