Saturn black large platter

Bone china

Bone china is a kind of porcelain body originally produced in the United Kingdom in which calcined ox bone, bone ash, is a major part. It is characterised by supreme whiteness, strength and translucency. saturn black large platter may be an example of this process.

The first use of bone ash in ceramics is assigned to Thomas Frye in 1748 in which he used it to introduce a type of soft-paste porcelain. In As the 18th century drew to a close, Josiah Spode carried on with further developments, and consequently made it popular, by mixing it with kaolin, China stone and china clay to compete with the imported Oriental porcelain.

The original elemental formula of six parts bone ash, three and a half parts china clay, and four parts china stone remains the standard English body.

Bone china production commonly employs a 2 stage firing process where the initial "biscuit" is fired without a glaze at 1280°C (2336°F) giving a semiopaque product and then it is glaze, or glost, fired at a lower temperature under 1080°C (1976°F). saturn black large platter is probably made using this technique.

Soft-paste porcelain

Soft-paste porcelain is a type of porcelain and therefore a ceramic product.

Its history dates from the initial experiments by potters from Europe to replicate Chinese porcelain by using compounds of china clay and frit or ground-up glass; lime and soapstone were also known to have been used in some mixtures. As these early combinations suffered from high pyroplastic deformation, or slumping in the oven at high temperature, they were uneconomic to produce. Formulations were later used based on nepheline syenite, quartz, feldspars, kaolin and other feldspathic rocks. These were technically superior and are still in production to this day.

Hard-paste porcelain

Hard-paste porcelain is a hard, dense ceramic that was first produced from a combination of the feldspathic rock petuntse and kaolin fired at very high temperature. It was first manufactured in China around the ninth century.

The secret of its manufacture was unknown in Europe until the early 18th century, when Böttger of Meissen, Germany discovered the formula. In spite of attempts to keep it secret, the procedure spread to other German ceramic manufacturers and eventually became well known throughout the whole of Europe.

Hard-paste porcelain can be fired at a range of temperatures to manufacture a myriad of different end results. Depending on the firing process, hard-paste porcelain can resemble stoneware or earthenware. Most of the time however, it is unnecessary to make use of hard-paste porcelain for such lower temperature ceramics. Hard-paste porcelain can be utilized to create porcelain bisque, a hard crystalline material fired at extremely high temperatures in a pressure controlled environment. This method produces a translucid bright white ceramic. Unlike other bisque ceramics, porcelain bisque is almost inpenetrable by water, therefore it becomes unnecessary to glaze the body before painting. Manufacturers such as Lladro, Hummel and Precious Moments use hard-paste porcelain simply for this reason, this could include saturn black large platter.