Patent ID: 7534735

Claim:
Coloured soda-lime glass which comprises principal glass-forming constituents and colouring agents: total iron in a quantity which, expressed in weight of the oxide Fe 2 O 3 in relation to the total weight of glass, is greater than or equal to 0.5% and less than or equal to 1.0%; ferrous iron in a quantity which, expressed in weight of atoms of Fe 2+ in relation to total weight of iron atoms present in the glass (ratio of Fe 2+ /total Fe), lies in the range of between 20% and 65%; titanium in a quantity which, expressed in weight of TiO 2 in relation to the total weight of glass, is greater than or equal to 1.0%; chromium in a quantity which, expressed in weight of Cr 2 O 3 in relation to the total weight of glass is at least 50 ppm; and the glass has: a light transmission, measured for illuminant A and calculated for a thickness of 4 mm (TLA4), which lies in the range of between 15% and 55%; a total transmission in the ultraviolet measured for a thickness of 4 mm (TUV4) of less than or equal to 30%; and a dominant wavelength in transmission (λ D ) of less than or equal to 491 nm.