art glass Hard, transparent material composed mainly of silicates and has been known since ancient times. Glass, Glass (beam), glass (Shoushi) also called. "Glass" is written "glass" to read as it is also common. The chemical compound state and silicate glass (silicate minerals) is. If you want to differentiate between chemical composition of glass and the other main component and said silicate glass or silicate glass. Including fused silica. This article only describes mainly about the substance. jewelry Beginning of the jewelry, it was the magical equipment themselves rather than objective. In order to protect themselves from predators, that began to be worn at all times have a magic thing. My power and the emergence of ruling class, learned the purpose of showing high identity to others. Come to acquire a religious symbol, such as cross ties for the development of religion and God. Humans began to wear wealthy class and the general community will also eventually changed the original purpose and object rather than purely for beauty. Has a long history of glass, silicon dioxide in ancient Egypt and Mesopotamia before 4000 BC (silica) are believed to have started to melt the surface of the prepared beads. At that time, was used instead of glass as a material itself, but was used in relation to production and ceramics. Many have been excavated in opaque or colored green and blue for raw materials such as sand mixed with metal impurities. The use of glass dating back more natural. Solidified lava are spewing from the volcano like the glass is called obsidian, has been used as an arrowhead and stone knife from the stone age. Ancient glass sand, silica, soda ash, lime and other ingredients Celsius to melt at temperatures above 1,200 degrees, was produced in the process of cooling and solidifying. The glass manufacturing because it requires a lot of fuel, wood is placed in a glass workshop, relied on fuel wood. Therefore, so look for the following forest trees of the forest fire �sKushitara, is the glass factory had been on the move throughout the forest. Now standing in a glass factory, because it is used as coal and oil. In Western Asia and Egypt to the 2000s BC, it became clear that the lower melting temperature and heat the silica with sodium carbonate and natural plant ash, some in sintering using it can process glass by melting without was. This is the beginning of cast glass. Around 1550 BC, made a glass bowl first by law core making equipment and poured into a type of clay in Egypt and Misopotamia in Egypt in particular has been fabricated works of various techniques, to exchange and glass jewelry but another time. But the civilization of the eastern Mediterranean had become the center of glass manufacturing declined in the 12th century BC, the time will be lost once the high-tech. This is a revival of coastal Syria and Mesopotamia in the 8th century BC Palestine. In the first century of Ptolemaic Egypt from the fourth century BC, an advanced technique of glass is made at the request of the royal family, whose output was one of the Hellenistic culture. 8th century BC in China at the 5th century BC, was produced mainly to seal the glass and lead glass beads. In Japan, at the 3rd century BC 3rd century AD glass beads were made by the alkali-lime glass and lead glass.