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Beer bottles of different colors. Glass coloring and color marking may be obtained in several ways. by the addition of coloring ions, [1] [2] by precipitation of nanometer-sized colloids (so-called striking glasses [1] such as "gold ruby" [3] or red "selenium ruby"), [2] Ancient Roman enamelled glass, 1st century, Begram Hoard.
Purple of Cassius is a purple pigment formed by the reaction of gold salts with tin (II) chloride. It has been used to impart glass with a red coloration (see cranberry glass ), as well as to determine the presence of gold as a chemical test . Generally, the preparation of this material involves gold being dissolved in aqua regia, then reacted ...
Bohemian glass-workers discovered potash combined with chalk created a clear colourless glass that was more stable than glass from Italy. In the 16th century the term Bohemian crystal was used for the first time to distinguish its qualities from glass made elsewhere. This glass contained no lead as is commonly suspected.
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Cranberry glass. The beaker with lid made from Gold Ruby is attributed to Johann Kunckel. Cranberry glass or 'Gold Ruby ' glass is a red glass made by adding gold salts or colloidal gold to molten glass. Tin, in the form of stannous chloride, is sometimes added in tiny amounts as a reducing agent. The glass is used primarily in expensive ...
The Boston Celtics beat a Cleveland Cavaliers team without Donovan Mitchell in Game 4 of their second-round NBA playoff series. The 109–102 win gave Boston a 3-1 lead in their matchup.