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Have you heard some details about glass casting?

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Have you heard some details about glass casting? 
By megan2008 on Oct 26, 2013 03:39 AM
Glass casting is the process in which glass objects are castby directing molten glass into a mould where it solidifies. The technique has been used since the Egyptian period. Modern cast glass is formed by a variety of processes such as kiln casting, or casting into sand, graphite or metal moulds.

During the Roman period moulds consisting of two or more interlocking parts were used to create blank glass dishes. Glass could be added to the mould either by frit casting, where the mould was filled with chips of glass (called frit) and then heated to melt the glass, or by pouring molten glass into the mould.Evidence from Pompeii suggests that molten hot glass may have been introduced as early as the mid-1st century CE.Blank vessels were then annealed, fixed to lathes and cut and polished on all surfaces to achieve their final shape.Pliny the Elder indicates in his Natural History (36.193) that lathes were used in the production of most glass of the mid-1st century.

Italy is believed to have been the source of the majority of earlyImperial polychrome cast glass, whereas monochrome cast glasses are more predominant elsewhere in the Mediterranean.Forms produced show clear inspiration from the Romanbronze and silver industries, and in the case of carinated bowls and dishes, from the ceramic industry.Cast vessel forms became more limited during the late 1st century, but continued in production into the second or third decade of the 2nd century.Colourless cast bowls were widespread throughout the Roman world in the late 1st and early 2nd century CE, and may have been produced at more than one centre.Some revival of the casting technique appears in the 3rd or 4th century, but appears to have produced relatively small numbers of vessels.

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