Method of dating glass objects

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Category: Romanian
Added: 6 months ago
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Principles of design Between mosaic and painting , the art with which it has most in common, there has been a reciprocal influence of varying intensity. In colour and style the earliest known Greek figurative mosaics with representational motifs, which date from the end of the 5th century bce, resemble contemporary vase painting, especially in their outline drawing and use of very dark backgrounds. The mosaics of the 4th century tended to copy the style of wall paintings , as is seen in the introduction of a strip of ground below the figures, of shading, and of other manifestations of a preoccupation with pictorial space. In late Hellenistic times there evolved a type of mosaic whose colour gradations and delicate shading techniques suggest an attempt at exact reproduction of qualities typical of the art of painting.
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History of glass

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Colorless is preferred over the term "clear" or "white" glass since the former term refers more accurately to the transparency of the glass not its color, i. Colorless glass was a goal of glass manufacturers for centuries and was difficult to produce because it required the use of virtually impurity-free materials. Venetian glass makers produced their crystallo as early as the 15th century and glass makers in 18th century England made what was known as "flint" glass from virtually pure quartz rock calcined flint which was simply called "flint" Hunter Improved chemistry and glass making methods of the late 19th and early 20th century allowed for process efficiencies that made colorless glass easier and much cheaper to produce with the use of various additives in the glass mixture. The term flint glass was and still is used somewhat erroneously by glassmakers to describe colorless glass that is made with low iron sand. It is, however, not true flint glass.
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The thermoluminescence technique is the only physical means of determining the absolute age of pottery presently available. It is an absolute dating method, and does not depend on comparison with similar objects as does obsidian hydration dating, for example. Most mineral materials, including the constituents of pottery, have the property of thermoluminescence TL , where part of the energy from radioactive decay in and around the mineral is stored in the form of trapped electrons and later released as light upon strong heating as the electrons are detrapped and combine with lattice ions. By comparing this light output with that produced by known doses of radiation, the amount of radiation absorbed by the material may be found.
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Principles[ edit ] As a novel glass forming technique created in the middle of the 1st century BC , glassblowing exploited a working property of glass that was previously unknown to glassworkers; inflation, which is the expansion of a molten blob of glass by introducing a small amount of air to it. That is based on the liquid structure of glass where the atoms are held together by strong chemical bonds in a disordered and random network, [1] [2] [3] therefore molten glass is viscous enough to be blown and gradually hardens as it loses heat. With reference to their studies of the ancient glass assemblages from Sepphoris of Israel, Fischer and McCray [5] postulated that the concentration of natron , which acts as flux in glass, is slightly lower in blown vessels than those manufactured by casting. Lower concentration of natron would have allowed the glass to be stiffer for blowing.

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