ceramic objects are made mostly of clay and quartz sand - chemically speaking aluminum and silicon raw materials that are as old as the earth itself.
The clay is used in powder form. Quartz sand, which is very common in Europe, derives from the natural decomposition of rocks containing quartz, such as rock crystals present in the rivers and the sea, which consists of silicon dioxide.
thermoluminescence is only suitable for dating the excavations, as it can measure the Earth's radiation absorbed by the crystals of clay bodies.
Ceramics that are not buried in the country, regardless of their nature, can not be dated, but the margin of error of 200-300 years. This means that a piece of porcelain can equally well be from the 17th and the 19th century.
To be distinguished from other porcelain ceramic material, there is a simple, reliable, and the age old test: if one taps one elbow on the edge of the panel took place only in the middle, a different ringing tone tells us that the porcelain. This unmistakable resonance depends on the porcelain outstanding compact texture.
During the Song and Yuan dynasties porcelain made at Jingdezhen and other kiln sites in southern China using crushed and refined porcelain stone itself, but the early eighteenth century, kaolin and porcelain stone were mixed about the same proportion. China clay when added to the body of material produced a porcelain of great strength and whiteness (whiteness, especially the much sought after property of porcelain, especially the use of blue and white goods ).
porcelain body porcelain stone fire at lower temperatures in the region of 1250 degrees Celsius, than those with a mixture of kaolin and porcelain stone, which require ignition to the region of 1350 degrees Celsius.
in a typical high temperature, the southern oval kiln varied greatly, from hot, close to the furnace, the refrigerator, near the chimney at the opposite end of the furnace. One of the advantages gained with the addition of varying amounts of kaolin in the composition of the paste could be altered to fit the view that the goods than he would have in a furnace with a clay rich mixture is used for goods are fired at the end of the furnace and hot stone rich mix is used for goods being shot at the end of the furnace cooler.
