What does glass mean, and what does glass mean?

Ancient China's history of manufacturing glass, can be traced back to the Western Zhou period, since the Zhou Dynasty literature and other documents have appeared: "Mulin", "fire Qi", "glaze", "quite Li", "bright moon beads" and so on, the later note more generally called different kinds of jade, that is, "five-color stone". The two Han Dynasty, the Western countries of the glass imported into China, only after the name of the glass. However, there is a big difference between the composition of Chinese glaze and that of Western glass, as the former contains lead and barium, while the latter is dominated by sodium and calcium. The Chinese glaze material was originally obtained from the by-products of bronze casting, refined and processed and then made into glaze. Therefore, some people say that glass was introduced from the West, which is not very accurate. And archaeological excavations, proved that the Western Zhou period has been glazed products, according to expert analysis, these glaze and artificial beads and jade, and the name is not a strict distinction, usually will be translucent known as "glaze", transparent only known as "glass", and then there are Medicine jade, jar jade, nitrate, material and other names, and to material a most common use.