Coalport snowman dancing at the party

Bone china

Bone china is a kind of porcelain body initially developed in the UK in which calcined ox bone, bone ash, is an essential part. It is distinguish by high whiteness, translucency and strength. coalport snowman dancing at the party may be an example of this process.

The first use of bone ash in ceramics is assigned to Thomas Frye in in the late 1740s in which he used it to make a type of soft-paste porcelain. In As the eighteenth century drew to a close, Josiah Spode carried on with further developments, and consequently popularised it, by mixing it with china clay, kaolin and China stone to compete with the imported Oriental porcelain.

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

Bone china production generally makes use of a two stage firing where the initial "biscuit" is fired without a glaze at 1280°C (2336°F) giving a translucid product and then it is glaze, or glost, fired at a lower temperature less than 1080°C (1976°F). coalport snowman dancing at the party is probably manufactured using this approach.

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 replicate Chinese porcelain by employing concoctions of china clay and frit or ground-up glass; lime and soapstone were known to have also been added in some mixtures. As these first combinations were prone to high pyroplastic collapse, or slumping in the kiln at raised temperature, they were uneconomic to produce. Compounds were later used based on nepheline syenite, kaolin, feldspars, quartz 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 formulation of the feldspathic rock petuntse and kaolin fired at very high temperature. It was first made in China in about the ninth century.

The secret of its manufacture was unknown in Europe until the early 18th century, when Böttger of Meissen, Germany uncovered the formula. Regardless of attempts to keep it secret, the procedure spread to other German ceramic factories and finally became widely used throughout Europe.

Hard-paste porcelain is known to be fired at a range of temperatures to make many individual end results. Depending on the firing process, hard-paste porcelain can resemble earthenware or stoneware. Mainly however, it is unnecessary to use hard-paste porcelain for such lower temperature ceramics. Hard-paste porcelain can be employed to create porcelain bisque, a hard crystalline material fired at extremely high temperatures in a pressure controlled environment. This method makes a semitransparent bright white ceramic. Unlike other bisque ceramics, porcelain bisque is almost impermeable by water, therefore it becomes unnecessary to glaze the body before painting. Manufacturers such as Precious Moments, Lladro and Hummel make use of hard-paste porcelain just for this reason, this could include coalport snowman dancing at the party.