Dating royal worcester plates
The following section provides background information on the methods used to form, decorate, finish, glaze, and fire ceramic wares.Unlike their lower-fired counterparts, porcelain wares do not need glazing to render them impermeable to liquids and for the most part are glazed for decorative purposes and to make them resistant to dirt and staining.is a ceramic material made by heating materials, generally including kaolin, in a kiln to temperatures between 1,200 and 1,400 °C (2,200 and 2,600 °F).The toughness, strength, and translucence of porcelain, relative to other types of pottery, arises mainly from vitrification and the formation of the mineral mullite within the body at these high temperatures.In soil mechanics, plasticity is determined by measuring the increase in content of water required to change a clay from a solid state bordering on the plastic, to a plastic state bordering on the liquid, though the term is also used less formally to describe the ease with which a clay may be worked.Clays used for porcelain are generally of lower plasticity and are shorter than many other pottery clays.It combines well with both glazes and paint, and can be modelled very well, allowing a huge range of decorative treatments in tablewares, vessels and figurines. The European name, porcelain in English, come from the old Italian porcellana (cowrie shell) because of its resemblance to the translucent surface of the shell.
The Ming Dynasty controlled much of the porcelain trade, which was expanded to Asia, Africa and Europe via the Silk Road.
There is no precise date to separate the production of proto-porcelain from that of porcelain.
Although proto-porcelain wares exist dating from the Shang Dynasty (1600–1046 BC), by the time of the Eastern Han Dynasty period (206 BC – 220 AD), glazed ceramic wares had developed into porcelain, on a Chinese definition as high-fired ware.
The composition of porcelain is highly variable, but the clay mineral kaolinite is often a raw material.
Other raw materials can include feldspar, ball clay, glass, bone ash, steatite, quartz, petuntse and alabaster.