Product of a technique first used in ancient Egypt and later developed in ancient Rome. The outer of two superimposed layers of glass was ground away to leave a pattern consisting of a pattern standing in relief on a contrasting ground, usually white on dark blue. The finest surviving example is the Portland Vase (early 1st cent. ...
Article
Rupert Featherstone
Stone or glass implement with a flat base, used to grind paints by hand on a hard flat surface or slab. Mullers and slabs of hard stone are first recorded in ancient Egypt. Large glass mullers were used for the commercial preparation of paints until the 19th century. Pigments could be ground on their own for use in fresco or aqueous media or ground in oil for later use....
Article
Gordon Campbell
Glass that resembles semi-precious stones; made by firing a paste of crushed glass bound with water and an organic gum. The process originated in ancient Egypt, and was revived in the 1880s by the French sculptor
