A transparent glass which, at a thickness of 2 mm, does not transmit more than about 1% of ultraviolet radiation at a wavelength of 380 nm and exhibits a neutral gray, fixed tint bounded by apices A, B, C, D, A of the drawing, a purity no higher than 6, and a luminous transmittance between 10-16, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________SiO.sub.2 65-72 CaO 0-1.5B.sub.2 O.sub.3 2-6 Al.sub.2 O.sub.3 + CaO 0.2-2.25Na.sub.2 O 6-10 As.sub.2 O.sub.3 0-0.3K.sub.2 O 10-16 Fe.sub.2 O.sub.3 4.8-6.2Na.sub.2 O + K.sub.2 O 17-23 Co.sub.3 O.sub.4 0.012-0.02K.sub.2 O:Na.sub.2 O 1.25-2.25 NiO 0.16-0.21Al.sub.2 O.sub.3 0-2.25 ZnO 0-1.5.______________________________________