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A popular use for biscuit porcelain was the manufacture of bisque dolls in the 19th century, where the porcelain was typically tinted or painted in flesh tones. In the doll world, "bisque" is usually the term used, rather than "biscuit". [4] Parian ware is a 19th-century type of biscuit. Lithophanes were normally made with biscuit.
The firing of the ware that results in the biscuit article causes permanent chemical and physical changes to occur. These result in a much harder and more resilient article which can still be porous, and this can ease the application of glazes.
The technique essentially uses powdered glass mixed with coloured pigments, and is the application of vitreous enamel to pottery; enamelled glass is very similar but on glass. Both these latter two are essentially painting techniques, and have been since they began.
The cleaning, handling, storage, and in general treatment of ceramics is consistent with that of glass because they are made of similar oxygen-rich components, such as silicates. [2] In conservation ceramics are broken down into three groups: unfired clay, earthenware or terracotta, and stoneware and porcelain. [3]
Though the recipe of tin glazes may differ in different sites and periods, the process of the production of tin glazes is similar. Generally speaking, the first step of the production of tin glazes is to mix tin and lead in order to form oxides, which was then added to a glaze matrix (alkali-silicate glaze, for example) and heated. [19]
Lead-glazed earthenware is one of the traditional types of earthenware with a ceramic glaze, which coats the ceramic bisque body and renders it impervious to liquids, as terracotta itself is not. Plain lead glaze is shiny and transparent after firing. Coloured lead glazes [1] are shiny and either translucent or opaque after firing.
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