Rene Lalique, Oran, Phosphate opal glass, mould-blown using four-part mould, acid-etched. Height eavy-form vase with raised opalescent flowers and background leaf pattern. R. Lalique France etched to base. Model created on 2nd September 1927, not continued after 1947. Height 26 cm, diameter 27 cm
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- Opalescent / Opaline - The descriptions of glass as "opalescent" or "opaline" are often used interchangeably by dealers and auction houses. At the upper end of the scale, opalescent / opaline glass can refer to the opal-like milky blue glass produced by Lalique and Etling. It also refers to the pressed glass mass produced in Britain from the 1840s with a milky white edge as sugar-basins, milk jugs and vases were made in great quantities for the mass market, and were sold at fairs along with Staffordshire figures and wooden dolls. A less common type of opalescent glass was made from two layers of glass blown into a mould.
- Etched - Glass decorated with an etched design, which is achieved through marking out the pattern, protecting the area that is not be etched, and then immersing the object in acid to dissolve the surface of the unprotected area. With some glass objects, such as cameo glass, there may be several layers of different coloured glass, and part of the top layer is dissolved leaving the bottom layer as the background. The longer the time of exposure of the object to acid, the deeper the etching.
The word etching is also sometimes used to describe another method of decoration, where wheel grinders were used decorate the surface, but this technique is usually known as engraving.
- Opal Glass - Opal glass, also known as milk glass, is a type of opaque glass that is usually white or cream-colored, with a slightly translucent appearance resembling opal. It is produced by adding various materials to the glass during the manufacturing process, such as tin, fluorides, or phosphates, which give it its characteristic milky appearance.
Opal glass has been used for centuries in the production of decorative objects, such as vases, lamps, lamp shades and figurines. It was particularly popular in the 19th century in Europe, where was used by glass makers such as Lalique.
Opal glass is still used today in the production of a wide range of decorative and functional objects, including lampshades, jewelry, and kitchenware. Its milky appearance gives it a timeless, elegant look that is popular with collectors and enthusiasts of antique and vintage glassware.
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