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Conservation and restoration of ceramic objects is a process dedicated to the preservation and protection of objects of historical and personal value made from ceramic. Typically, this activity of conservation-restoration is undertaken by a conservator-restorer , especially when dealing with an object of cultural heritage .
It is distinct from true East Asian lacquer, which is made by coating objects with a preparation based on the dried sap of the Toxicodendron vernicifluum tree, which was not available in Europe. Japanning is most often a heavy black lacquer, almost like enamel paint. Black is common, and japanning is often synonymous with black japanning.
Often, a final coat of wax is applied over the finish to add a degree of protection. French polishing is a finishing method of applying many thin coats of shellac using a rubbing pad, yielding a very fine glossy finish. Ammonia fuming is a traditional process for darkening and enriching the color of white oak.
For example, a mixture of titanium and ceramic can be sandblasted onto the pan surface, and then fired at 2,000 °C (3,630 °F) to produce a non-stick ceramic coating. [19] Ceramic nonstick pans use a finish of silica (silicon dioxide) to prevent sticking. It is applied using a sol-gel process without the use of PFAS. [20] The coating layer of ...
Traditional Asian lacquer has been used for centuries [2] and is derived from sap, prominently that from the Urushi tree; part of the sumac family grown throughout Japan, China and Korea. [3] Sap from the tree contains a chemical compound called urushiol that hardens when exposed to humidity. [4] The sap is processed to remove impurities. [5]
Upon excavation, much of the furniture was conserved with paraffin wax mixed with carbon powder, which coats the wood and obscures important details such as decorations and joinery. It is now impossible to remove the wax coating without further damaging the furniture. Several wooden pieces were found with bone and metal fittings. [95]
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Ceramic glaze, or simply glaze, is a glassy coating on ceramics. It is used for decoration, to ensure the item is impermeable to liquids and to minimize the adherence of pollutants. [1] Glazing renders earthenware impermeable to water, sealing the inherent porosity of earthenware. It also gives a tougher surface.
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