Dating royal crown derby porcelain
They wet very quickly, meaning that small changes in the content of water can produce large changes in workability.
A more common terminology these days for the unfired material is "body"; for example, when buying materials a potter might order an amount of porcelain body from a vendor.
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.
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.