Orchard hill open sugar

Bone china

Bone china is a kind of porcelain body first developed in Britain in which calcined ox bone, bone ash, is a critical constituent. It is differentiated by supreme whiteness, translucency and strength. orchard hill open sugar may be an example of this process.

The initial use of bone ash in ceramics is associated with Thomas Frye in in the late 1740s in which he used it to develop a type of soft-paste porcelain. In In the late 18th century, Josiah Spode carried on with further developments, and duly popularized it, by combining it with China stone, china clay and kaolin to compete with the imported Oriental porcelain.

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

The production of bone china usually involves a two stage firing where the first "biscuit" is fired without a glaze at 1280°C (2336°F) giving a semitransparent product and then it is glost, or glaze, fired at a lower temperature less than 1080°C (1976°F). orchard hill open sugar is probably manufactured using this technique.

Soft-paste porcelain

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

Its origin dates from the early undertakings by potters from Europe to imitate Chinese porcelain by employing compositions of china clay and ground-up glass (aka frit); lime and soapstone were also known to have been included in some mixtures. As these initial combinations suffered from high pyroplastic deformation, or slumping in the oven at raised temperature, they were uneconomic to manufacture. Formulations were later produced based on nepheline syenite, kaolin, quartz, feldspars and other feldspathic rocks. These were technically superior and are still in production today.

Hard-paste porcelain

Hard-paste porcelain is a hard, dense ceramic that was originally produced from a concoction of the feldspathic rock petuntse and kaolin fired at extremely high temperature. It was first made in China in around the 9th century.

The secret of its manufacture was not known in Europe until the early 18th century, when Böttger of Meissen, Germany discovered the formula. Regardless of attempts to keep it secret, the procedure was taken up by other German ceramic manufacturers and in time became known throughout Europe.

Hard-paste porcelain is fired at a range of temperatures to create many individual end results. Depending on the firing process, hard-paste porcelain can be manufactured to resemble stoneware or earthenware. But most of the time, it is unnecessary to make use of hard-paste porcelain for these lower temperature ceramics. Hard-paste porcelain can be used to make porcelain bisque, a hard crystalline material fired at very high temperatures in a pressure controlled environment. This method gives birth to a semiopaque bright white ceramic. Unlike other bisque ceramics, porcelain bisque is almost inpenetrable by water, therefore it becomes unnecessary to glaze the body before decorating. Manufacturers such as Precious Moments, Hummel and Lladro use hard-paste porcelain just for this reason, this could include orchard hill open sugar.