Osterley plate 10 5 8 inch

Bone china

Bone china is a type of porcelain body first used in Great Britain in which calcined ox bone, bone ash, is a critical ingredient. It is distinguish by brilliant whiteness, strength and translucency. osterley plate 10 5/8 inch may be an example of this procedure.

The initial use of bone ash in ceramics is attributed to Thomas Frye in 1748 in which he used it to introduce a kind of soft-paste porcelain. In At the close of the eighteenth century, Josiah Spode continued with further developments, and consequently popularized it, by mixing it with china clay, China stone and kaolin to compete with the imported Oriental porcelain.

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

The manufacture of bone china customarily employs a 2 stage firing process 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 below 1080°C (1976°F). osterley plate 10 5/8 inch is probably manufactured using this technique.

Soft-paste porcelain

Soft-paste porcelain is a type of porcelain and consequently a ceramic material.

Its history dates from the initial trials by potters from Europe to clone Chinese porcelain by employing combinations of china clay and ground-up glass (aka frit); lime and soapstone were known to have also been used in some concoctions. As these early compounds were prone to high pyroplastic collapse, or slumping in the oven at raised temperature, it was uneconomical to produce them. Formulations were later developed based on kaolin, quartz, feldspars, nepheline syenite and other feldspathic rocks. These were technically superior and continue in production to this day.

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 seventeen hundreds, when Böttger of Meissen, Germany uncovered the formula. In spite of attempts to keep it secret, the process spread to other German ceramic potteries and eventually became known throughout the whole of Europe.

Hard-paste porcelain is fired at a range of temperatures to make a multitude of individual end results. Depending on the firing approach, hard-paste porcelain can be made to resemble stoneware or earthenware. Generally however, it is not necessary to use hard-paste porcelain for these lower temperature ceramics. Hard-paste porcelain can be used to manufacture porcelain bisque, a hard crystalline product fired at very high temperatures in a pressure controlled environment. This process manufactures a translucid bright white ceramic. Unlike other bisque ceramics, porcelain bisque is almost impermeable by water, therefore it becomes unnecessary to glaze the body before decorating. Manufacturers such as Precious Moments, Hummel and Lladro make use of hard-paste porcelain exactly for this reason, this could include osterley plate 10 5/8 inch.