The source of bone china

Bone China is the only porcelain invented by Westerners in the world, and it has been given a high value. In fact, the appearance of bone china is purely accidental, strictly speaking, it is an unexpected result of a less successful imitation. 'Cambridge History of China' describes the invention of bone china as follows: Ancient Chinese ceramics are extremely valuable in the West, and their export history can even be traced back to two thousand years ago. In Europe, the work of imitating ceramics has never been interrupted, but the real breakthrough is also attributed to the development of the Venetian glass industry. Today, people know that ceramics are composed of an enamel layer, a bonding layer, and an inner clay layer. One of the most difficult to imitate is the enamel layer. In the 15th century, the Venetians invented lead glass. After that, a lot of attempts have been made in this field. People have found that the enamel layer of ceramics is somewhat similar to glass. About the seventeenth century, the thin porcelain tableware of Jingdezhen, China, was introduced to Europe. This is a shocking invention. The Chinese history book 'Tao Ji' says that this type of porcelain: 'Thin as paper, as white as jade, as bright as a mirror, and as sound as a mirror. Chime'. The European saying is: 'Thinner than paper, whiter than milk, and more transparent than glass' (literal translation). This kind of porcelain is invaluable in Europe. A piece of porcelain can even be exchanged for an army. What's even more amazing is that this kind of porcelain can even be made into lamps, but it has a more fantastic effect than glass lamps. In order to obtain the effect of 'more transparent than glassBone meal can obtain calcium oxide after high temperature, which is a very mature technique in glass process. In order to obtain the milky white of the thin porcelain, he added some aluminum powder. Today's technology tells us that calcium oxide is one of the most important fluxes in glass manufacturing. It can effectively reduce the softening temperature of silica and make it easier to form glass-like substances. Alumina is a commonly used opacifier, it can even make the glass appear less transparent milky white. Soon, a European ceramic was invented. Although it is still difficult to reach the thickness of thin porcelain with a thickness of about 1mm-2mm, and the color tone is slightly reddish, it is impossible to realize the high white color. After all, this is the only porcelain invented in the West. Its appearance is revolutionary. of. Because this kind of ceramic has a large amount of animal bone meal added in the firing, it is called 'Bone chinaToday’s bone china has been improved many times. The basic formula is six parts of ashes and four parts of porcelain stone, but it gradually developed into 50 parts of ashes, 25 parts of porcelain stone and 25 parts of clay. Think of it as a standard formula. Like the standard of artificial crystal, according to international standards, ceramics containing more than 25% calcium oxide can be called bone china. Since it was founded in the UK and the yield of bone china in the early days was very low, it has long been a special porcelain for the British royal family and is highly regarded. Today, due to the needs of industrialization and the development of science and technology, people no longer put animal bone meal, but use a composite formula of calcium oxide and aluminum oxide, making bone china available to more people. However, a very small number of high-end bone china production still partly uses raw materials such as bone meal, and the value is generally hundreds of pounds or even higher. Place the bone china in a bright place for observation. The bone china products with fine ingredients, light-transmitting and free of impurities are the first choice. Bone china, like ceramics, is graded, usually depending on the texture of the material, manufacturing technology, and painted design. The higher the grade of bone china, the more difficult it is to produce, and the more expensive the finished product.

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