An early type of glass made with lead oxide and resulted in clear or white appearance.
Discovered by George Ravenscroft in 1673. Often (not strictly correctly) called Flint glass, it contains Lead Oxide, as opposed to Potash glass or Soda glass. It cools rapidly, making it hard to manipulate into complex shapes, but its hardness and brilliance make it well-suited to cutting and engraving
So called because it contains around 25% lead oxide and popular in most parts of the world for use in the manufacture of cold cathode tubes and in particular the electrodes.
glass containing lead oxide; has a high refractive index
glass with a high lead content in the batch, which lowers the melting point and softens it for cutting; Lead Crystal was also used during the brilliant period of cut glass.
Glass that contains a high percentage of lead oxide (at least 20 percent of the batch). In modern times, glass of this type was first used by George Ravenscroft (1632-1683) about 1676. It is relatively soft, and its refractive index gives a brilliance that may be exploited by covering the surface with polished wheel-cut facets.
glass made with flint instead of sand, potash instead of soda, and twenty-five percent lead oxide. IGCB
Potassium-silicate formulas plus lead oxide are added to the molten glass
A glass that contains a large proportion of lead oxide. The addition of this oxide raises the refractive index and makes it much more brilliant than ordinary glass.
Lead glass is potassium silicate glass which has been impregnated with lead oxide (from 12% to 28% by weight) in its fabrication. The lead is not intended to affect the glass's ability to transmit light; depending on what the end use is to be, the goal is either to allow the glass to transmit visible light but to block x-rays, or to increase the refractive index of the glass, and thus its lustre, or sparkle. Its ability to refract light more efficiently than standard glass makes it an excellent material for prisms, decorative windows, and artificial jewelry.
