What is Flint Glass?
Flint Glass is a term for glassware with a lead content, pressed and/or blown. In the United States Flint Glass was produced prior to the Civil War. Pieces with lead content are much heavier and have a bell sound or ring when you ping the glass with your finger. Most English Pressed Glass has a lead content, as they believed one had to add lead to glass to give the glass durability and brilliance. American Flint coloured pieces are considered rare.
Flint glass refers to a type of optical glass recognized for its high transparency and refractive value. The origin of flint glass took place in the 1600s, when powdered flint became an additive used to improve the quality of blown glass. It is also a name for certain types of pressed glass dishware made throughout England and the United States between 1820 and 1865. The first true flint glass was developed in 1662 by English glassmaker and businessman George Ravenscroft. He used particles of flint to produce a particularly refractive and refined type of glass. Flint glass became the standard of excellence in glassmaking technology until it was discovered that lead added to the silica mixture produced a far superior glass. Although it is more properly called lead glass, the name “flint glass” remains in common use. Modern industry uses flint glass primarily to make optical lenses. Optical glass has many scientific and military uses, such as binoculars, gun sights, telescopes, periscope
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