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Mercury glass (or silvered glass) is glass that was blown double walled, then silvered between the layers with a liquid silvering solution, and sealed. Although mercury was originally used to provide the reflective coating for mirrors, elemental mercury was never used to create tableware. Silvered glass was free-blown, then silvered with a solution containing silver nitrate and grape sugar (glucose) in solution, heated, then closed. Sealing methods include metal discs covered with a glass round (England) or a cork inserted into the unpolished pontil scar (American). "Mercury" silvered glass was produced originally from around 1840 until at least 1930 in Bohemia (now the Czech Republic), Germany and also manufactured in England from 1849-55. Companies in the United States, including the Boston and Sandwich Glass Company, New England Glass Company and the Boston Silver Glass Company, made silvered glass from about 1852-80. Vases, goblets and all form of tableware were decorated with a variety of techniques including painting, enameling, etching, and engraving. Silvered "mercury" glass is considered one of the first true "art glass" types, that is, glass that was made for display and for its inherent artistic value rather than for utilitarian use.
Authentic antique silvered glass pieces are still available in a wide range of decorative items and usually sold as mercury glass.
There are many reproductions currently marketed as "mercury glass," in table form, ornaments and other objects. New "mercury glass" can be distinguished from antique silvered glass in several ways, including lack of a double wall, and solid bottoms that are different from true antique silvered glass.
- "Mirrored Images: American Silvered Glass 2001 - Accessed 2 Jul7 2008
- Diane Lytwyn, "Pictorial Guide to Silvered Mercury Glass", 2007
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