Florentine w1956 plate 10 5 8 inch

Bone china

Bone china is a kind of porcelain body initially developed in the UK in which calcined ox bone, bone ash, is an important ingredient. It is distinguish by extremely high whiteness, strength and translucency. florentine w1956 plate 10 5/8 inch may be an example of this procedure.

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

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

Bone china production commonly uses a two stage firing where the initial "biscuit" is fired without a glaze at 1280°C (2336°F) giving a semitransparent product and then it is glaze, or glost, fired at a lower setting less than 1080°C (1976°F). florentine w1956 plate 10 5/8 inch is probably made using this technique.

Soft-paste porcelain

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

Its origin dates from the early exertions by European potters to replicate Chinese porcelain by using compounds of china clay and frit or ground-up glass; soapstone and lime were also known to have been added in some mixtures. As these initial compositions were prone to high pyroplastic deformation, or slumping in the oven at raised temperature, they were not economical to manufacture. Formulations were later used based on kaolin, feldspars, nepheline syenite, quartz and other feldspathic rocks. These were technically superior and continue in production to the present day.

Hard-paste porcelain

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

The secret of its manufacture was not known in Europe until the early seventeen hundreds, when Böttger of Meissen, Germany found 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 manufacture a multitude of unique end results. Depending on the firing method, hard-paste porcelain can be made to resemble stoneware or earthenware. But generally, it is not necessary to use hard-paste porcelain for such lower temperature ceramics. Hard-paste porcelain can be used to create porcelain bisque, a hard crystalline product fired at extremely high temperatures in a pressure controlled environment. This approach manufactures 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 painting. Manufacturers such as Hummel, Lladro and Precious Moments utilize hard-paste porcelain just for this reason, this could include florentine w1956 plate 10 5/8 inch.