Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit -spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO.sub.2; 10.5-18 Al.sub.2O.sub.3; 5-14 Li.sub.2O; 2-12 B.sub.2O.sub.3; and 0.4-2 Fe.sub.2O.sub.3. Additionally, these glasses and glass-ceramics can exhibit the following criteria: a ratio:

[00001]$\frac{\left[{\mathrm{Li}}_2.Math.O+{\mathrm{Na}}_2.Math.O+K_2.Math.O+\mathrm{MgO}+\mathrm{ZnO}\right]}{\left[{\mathrm{Al}}_2.Math.O_3\right]}$ between 0.8 to 1.5.

The glass-ceramics also exhibit colors at an observer angle of 10 and a CIE illuminant F02 determined with specular reflectance of a* between 0.5 and 0.5, b* between 2.5 and +2, and L* between 90 and 93.

A crystallized glass raw material, characterized in that the crystallized glass raw material has a thickness of 0.02-5 mm, and the crystallized glass raw material has a crystallinity of 5-90 wt %. A preparation method for the crystallized glass raw material of the present invention has low processing difficulty and low processing cost; and the preparation method saves on time costs and also saves on energy for heat treatment.

A glass flux material for applying an opaque coating is provided. The glass flux material includes at least one pigment and a glass component with the following composition: SiO.sub.2 55-70 mol %, Al.sub.2O.sub.3 2.5-8 mol %, Bi.sub.2O.sub.3 0.5-<4 mol %, B.sub.2O.sub.3 14-27 mol %, with at least 2.5 mol % of at least one oxide of the group Li.sub.2O, Na.sub.2O, and K.sub.2O, wherein the ratio of alkali oxides to aluminum oxide ?R.sub.2O/Al.sub.2O.sub.3 is less than 6.

Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and can be used in particular as restorative materials in dentistry.

A coated glass or glass ceramic article is provided that has a so-called dead front effect, where display features or icons are not visible in the off state. In some embodiments, the glass or glass ceramic article includes a sheet-like glass or glass ceramic substrate having two opposite faces, where the substrate exhibits, in a visible spectral range from 380 nm to 780 nm, light transmittance .sub.vis of at least 1% for visible light that passes through from one face to the opposite face. An opaque coating on one face that exhibits, in the visible spectral range from 380 nm to 780 nm, light transmittance .sub.vis of not more than 5%. An opening is provided in the opaque coating. The opening allowing light that is incident on the surface of the opaque coating to pass through the coating and through the glass or glass ceramic substrate. The opening has a width of not more than 80 m at the glass or glass ceramic substrate.

A multi-layer glass enamel is disclosed. The various layers of the enamel are included to provide certain performance characteristics to the enamel. The components of each layer can be individually adjusted to tailor the performance characteristics influenced by that layer without changing the influence of the remaining layers.

A material system for a surface display unit that includes a first side (i.e., a proximal side) that faces a viewer of the surface display unit and a second side (i.e., a distal side) facing away from the viewer. The material system provides at least three appearance states, including a generally opaque first appearance state when the surface display unit is off (i.e., not used to display images), a second appearance state in which the material system is illuminated from the first (i.e., proximal) side to display a first image (e.g., information and/or decoration) that is perceptible to the viewer, and a third appearance state in which the material system is illuminated from the second (i.e., distal) side to display a second image (e.g., information and/or decoration) that is perceptible to the viewer. Surface display units, systems, and methods comprising the material system are also disclosed.

Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit -spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO.sub.2; 10.5-18 Al.sub.2O.sub.3; 5-14 Li.sub.2O; 2-12 B.sub.2O.sub.3; and 0.4-2 Fe.sub.2O.sub.3. Additionally, these glasses and glass-ceramics can exhibit the following criteria: a ratio: $\frac{\left[{\mathrm{Li}}_{2}O+{\mathrm{Na}}_{2}O+K_{2}O+\mathrm{MgO}+\mathrm{Zn}O\right]}{\left[{\mathrm{Al}}_2{O}_3\right]}$ between 0.8 to 1.5. The glass-ceramics also exhibit colors at an observer angle of 10 and a CIE illuminant F02 determined with specular reflectance of a* between 0.5 and 0.5, b* between 2.5 and +2, and L* between 90 and 93.

Embodiments of the present disclosure pertain to crystallizable glasses and glass-ceramics that exhibit a black color and are opaque. In one or more embodiments, the crystallizable glasses and glass-ceramics include a precursor glass composition that exhibits a liquidus viscosity of greater than about 20 kPa*s. The glass-ceramics exhibit less than about 20 wt % of one or more crystalline phases, which can include a plurality of crystallites in the Fe.sub.2O.sub.3TiO.sub.2MgO system and an area fraction of less than about 15%. Exemplary compositions used in the crystallizable glasses and glass-ceramics include, in mol %, SiO.sub.2 in the range from about 50 to about 76, Al.sub.2O.sub.3 in the range from about 4 to about 25, P.sub.2O.sub.5+B.sub.2O.sub.3 in the range from about 0 to about 14, R.sub.2O in the range from about 2 to about 20, one or more nucleating agents in the range from about 0 to about 5, and RO in the range from about 0 to about 20.

The present invention relates to a method for producing phase-separated glass, sequentially including a melting step of melting a glass, a phase separation step of separating phases in the glass, and a shaping step of shaping the glass, and to the phase-separated glass obtained by the production method.