A bluish-green aqua color. Ultramarine is produced by the mineral lazulite or from a micture of kaolin, soda ash, sulfur, and charcoal.
The technique of decorating glass in high relief by cutting away part of the glass between the body of an object and its decoration (e.g., on a cage cup).
Glass colored with uranium oxide. This brilliant yellow-green glass was first made in the 1830s.