| abstract |
PROBLEM TO BE SOLVED: To provide a dark gray color used for a blindfold area of a vehicle, have a constant color, and be compatible with a commercial flat glass manufacturing method, while enabling appropriate safety light illumination. Offers dull gray glass. SOLUTION: This is a dull gray colored glass composition, which contains 66 to 75% by weight of SiO 2 and 10 to 2 % of Na 2 O. 0 wt%, CaO 5-15 wt%, MgO 0-5 wt%, Al 2 O 3 0-5 wt%, and K 2 O 0-5 Weight percent base glass and Fe 2 O 3 (total iron) 0.6-0.935 wt%, FeO 0.30 wt% or less, CoO 60-180 ppm, and Se 5-29 and a colorant portion consisting essentially of ppm. Such a glass composition, wherein the glass is 3.9 mm thick and has a luminous transmittance of 20-39.28% and a stimulus purity of 3% or less. |