Porcelain derives its present name from Old Italian porcelain because of its resemblance to the translucent surface of the shell. Porcelain can informally be referred to as china in some English-speaking countries, as China was the birth place of porcelain making. Properties associated with porcelain include low permeability and elasticity considerable strength, hardness, glassiness, brittleness, whiteness, translucence, and resonance; and a high resistance to chemical attack and thermal shock.
Porcelain is generally believed to have originated in China. Although proto-porcelain wares exist dating from the Shang Dynasty about 1600 BCE, by the Eastern Han Dynasty high firing glazed ceramic wares had developed into porcelain, and porcelain manufactured during the Tang Dynasty period was exported to the Islamic world where it was highly prized. Many people love to collect antique glass and china. There are as many ways to collect vintage glass as there are collectors. With the varied colors, styles, and patterns collecting glass is a fascinating hobby. Carnival Glass is a beautiful, iridescent, pressed glass that was given away as prizes at carnivals. It must be iridescent to be true Carnival Glass.
[[[Depression glass]]] is the term used for glass plates and other items that were often given away as promotional gifts or sold very cheaply during the depression. [[[Vaseline Glass]]], also known as Uranium Glass, is a yellowish green color and glows under a black light. This is due to a small amount of radiation emitted by the glass. The observation that old windows are often thicker at the bottom than at the top is often offered as supporting evidence for the view that glass flows over a matter of centuries. It is then assumed that the glass was once uniform, but has flowed to its new shape, which is a property of liquid.
In actuality, the reason for this is that when panes of glass were commonly made by glassblowers, the technique used was to spin molten glass so as to create a round, mostly flat and even plate. This plate was then cut to fit a window. The pieces were not, however, absolutely flat; the edges of the disk became thicker as the glass spun. When actually installed in a window frame, the glass would be placed thicker side down both for the sake of stability and to prevent water accumulating in the lead cams at the bottom of the window. Occasionally such glass has been found thinner side down or thicker on either side of the window's edge, as would be caused by carelessness at the time of installation.
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