Abstract: A product having a transparent volume-coloured glass-ceramic is provided. The glass-ceramic includes, based on oxide, 58-72% by weight SiO2, 16-26% by weight Al2O3, 1.0-5.5% by weight Li2O, 2.0-<4.0% by weight TiO2, 0-<2.0 by weight ZnO, and 0.005-0.12% by weight MoO3, and where the glass-ceramic, based on a thickness of 4 mm, has a luminous transmittance ?vis of 0.5%-3.5%, and where the glass-ceramic has the property that after passage through the glass-ceramic, based on a thickness of 4 mm, light of the standard illuminant D65 has a colour locus in the white region A1 that in the CIExyY-2° chromaticity diagram is defined by the following coordinates: A1 0.3 0.27 0.28 0.315 0.35 0.38 0.342 0.31 0.3 0.27.

Abstract: A description is given of a coloured, transparent, lithium aluminium silicate glass-ceramic and also of the use thereof, said glass-ceramic possessing a light transmission Y of 2.5% to 10% and a spectral transmission ?(at 465 nm) of more than 1.0%.

Abstract: The present invention relates to a device and method for transporting, homogenizing or conditioning of glass melts or glass ceramic melts and is distinguished in that the new formation of bubbles after refining is at least reduced. The new formation of bubbles on the surfaces of components that are in contact with the melt is at least reduced by means of a layer having iridium as a material.