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Here's your guide to identifying whether your glass is vintage or antique, plus how to spot rare art glass, ... Any Signatures or Marks. Look to see if the glass has been signed or marked. Usually ...
Pontil scar on the base of a free-blown glass bowl. A pontil mark or punt mark is the scar where the pontil, punty or punt was broken from a work of blown glass.The presence of such a scar indicates that a glass bottle or bowl was blown freehand, while the absence of a punt mark suggests either that the mark has been obliterated or that the work was mold-blown.
Only glass products containing at least 24% lead oxide may be referred to as "lead crystal". Products with less lead oxide, or glass products with other metal oxides used in place of lead oxide, must be labeled "crystallin" or "crystal glass". [4] In the United States it is the opposite - glass is defined as "crystal" if it contains only 1% lead.
The color is caused by the size and dispersion of gold particles. Ruby gold glass is usually made of lead glass with added tin. Silver compounds such as silver nitrate and silver halides can produce a range of colors from orange-red to yellow. The way the glass is heated and cooled can significantly affect the colors produced by these compounds.
Another type of mark is found on glass baskets. Where the glass handles of the baskets are attached to the base of the basket a stamp is made. [9] Each handler had a specific pattern to help identify which handler attached the handle. [9] The marks began in the 1950s and were instituted by Frank M. and Bill Fenton. [9]
While McKee Glass was the first to produce tableware in this jadeite color glass, the history of this color dates back into the 19th century. [citation needed] Other U.S. and European glassmakers produced items in this color. Examples can be seen from various makers such as Tarentum Glass, Challinor Taylor, and Portieux Vallerysthal of France.
In the glass–making industry, the melted batch is called "metal". [3] The metal is typically shaped into the glass product (other than window glass) by glassblowing or pressing it into a mold. [4] The glass product must then be cooled gradually , or it will break. [5] An oven used for annealing is called a lehr. [6]
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