Dating in colonial times

18 Apr

This is sometimes used as a test for the nature of the body.

It is not known whether they succeeded in making it or not, but, certainly by the end of the 17th century, porcelain was being made in quantity, this time by a factory at Saint-Cloud, near Paris.Clay, the basic material of pottery, has two distinctive characteristics: it is plastic (i.e., it can be molded and will retain the shape imposed upon it); and it hardens on firing to form a brittle but otherwise virtually indestructible material that is not attacked by any of the agents that corrode metals or organic materials.Firing also protects the clay body against the effects of water.During the firing, which took place at a temperature of about 2,650 °F (1,450 °C), the petuntse vitrified, while the refractory clay ensured that the vessel retained its shape.In medieval times isolated specimens of Chinese porcelain found their way to Europe, where they were much prized, principally because of their translucency.