Online Encyclopedia

PASTE (O. Fr. paste, modern pate, Lat...

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Originally appearing in Volume V20, Page 890 of the 1911 Encyclopedia Britannica.
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PASTE (O. Fr. paste,
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modern pate,
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Late
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Lat. pasta, whence also in Span.,
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Port. and Ital., from Gr. 1r&vrrl or 1raara, barley porridge, or salted pottage, ir&ao'ety, to sprinkle with salt)
  , a mixture or composition of a soft plastic consistency . The
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term is applied to substances used for various purposes, as e.g. in cookery, a mixture of
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flour and
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water with lard, butter or suet, for making pies and pastry, or of flour and water boiled, to which
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starch or other ingredients to prevent souring are added, forming an adhesive for the affixing of wall-paper,
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bill-posting and other purposes . In technical language, the term is also applied to the prepared clay which forms the
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body in the manufacture of pottery and
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porcelain (see CERAMICS) and to- the specially prepared glass, known also as " strass," from which imitation gems are manufactured . This latter must be the purest, most transparent and most highly refractive glass that can be prepared . These qualities are comprised in the highest degree in a flint glass of unusual density from the large percentage of lead it contains . Among various mixtures regarded as suitable for strass the following is an example: powdered
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quartz 300 parts, red lead 470, potash (purified by
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alcohol) 163, borax 22, and white arsenic x
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part by
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weight .
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Special precautions are taken in the melting . The finished colourless glass is used for imitation diamonds; and when employed to imitate coloured precious stones the strass is melted up with various metallic oxides . Imitation gems are easily distinguished from real stones by their inferior hardness and by chemical tests; they may generally be detected by the comparatively warm sensation they communicate to the tongue .

End of Article: PASTE (O. Fr. paste, modern pate, Late Lat. pasta, whence also in Span., Port. and Ital., from Gr. 1r&vrrl or 1raara, barley porridge, or salted pottage, ir&ao'ety, to sprinkle with salt)
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