My system is not decent

Chapter 1220 Binary Formula
Generally speaking, China clay refers to the soil obtained by crushing porcelain stones, or artificially prepared porcelain raw materials.

And this kind of china clay is composed of kaolin, quartz, feldspar, etc., and the main components are silica and alumina.

Among them, kaolin is a kind of clay mainly composed of kaolinite.

Because of its poor plasticity and high melting point, kaolin alone cannot be used to make porcelain, and other raw materials must be mixed.

It is because of the incorporation of porcelain stones that the firing of porcelain can be made harder.

Therefore, the texture of low-temperature glazed porcelain and high-temperature glazed porcelain is different, and high-temperature glazed porcelain is harder, so the sound of ceramic beating is also different.

The knocking sound of high-temperature glazed porcelain is more crisp, while the knocking sound of low-temperature glazed porcelain is relatively dull.

And all this is due to the different textures of the ceramics themselves. The hardness of high-temperature glazed porcelain is stronger than that of low-temperature glazed porcelain, while low-temperature glazed porcelain is more fragile.

All these differences can be seen from the development history of ceramics.

When the early primitive ancestors made pottery, they just mixed the loess at hand into mud, and then fired simple pottery.

Later, with the development of production and living practices, the ancestors learned to use soil materials selectively.

Use the washed soil materials to make fine clay pottery, such as plates, bowls and other tableware.

Sand pottery, such as pots and other large containers, is made of soil mixed with gravel.

By the Shang and Zhou dynasties, potters' understanding of various soil materials had deepened.

At this time, people discovered that the pottery fired with kaolin had a compact texture, a hard carcass, and low water absorption, which greatly enhanced its practicability.

Later, people accidentally discovered that the pottery made of kaolin had some shiny things on the wall after it was fired in the kiln.

After repeated observations, these shiny things come from the dust of grass and wood fuel used in the kiln falling on the pottery blank.

Therefore, people mixed plant ash and water into a slurry and painted it on the surface of the pottery.

After being fired, the surface of the pottery has a layer of bright glass, which is called "glaze".

Kaolin + glaze + high-temperature firing is equal to the earliest "porcelain" in China.

Therefore, Huaxia Porcelain was born in this way.

In terms of time, it was no later than the Shang and Zhou Dynasties.

Because the quality of the "porcelain" at this time is still different from that of the real porcelain later, the academic circles call it "primitive porcelain".

Primitive porcelain was developed from pottery, and because it is very different from pottery in quality and function, it was favored as soon as it came out.

There are two main differences between primitive porcelain and pottery. The first point is that the materials are different.

Primitive porcelain uses kaolin (porcelain clay), which is far more malleable than clay used in ordinary pottery.

Therefore, it can shape more and more practical shapes.

Just like white flour and corn flour, white flour can be made into pastries in various shapes such as birds, piglets, and puppies.

And cornmeal can do much less modeling, because its "glutenness" (plasticity) is not as good as flour.

Furthermore, the texture is different. Because the content of silica and alumina contained in kaolin itself is higher than that of ordinary clay, the high temperature resistance of its embryo body is also higher than that of the latter.

The higher sintering temperature makes the texture hard, the carcass is tight, the water absorption is low, and the practicability is stronger.

It can be said that my country is the first country in the world to use kaolin.

After the Song Dynasty, people used this white sandy clay, which is mainly composed of quartz, clay minerals and mica minerals, to wash out white clay and use it as a fine material for making porcelain.

The extensive use of this kind of white clay has made the porcelain of Jingzhen in the past dynasties reach an unprecedented height in terms of quality and craftsmanship, surpassing the ceramics of some ancient kilns in northern my country, and its exquisiteness is comparable to that of jade.

Jingzhen was established during the Jingde period of the Northern Song Dynasty, that is, when the town was established from 1004 to 1007 A.D., the porcelain produced there was well-known throughout the country.

Jingci porcelain enjoys a high reputation. In addition to the high level of craftsmanship at that time, another reason is that the mineral raw materials for firing porcelain here are of good quality.

According to research by modern scholars, Jingzhen initially used nearby porcelain stones as raw materials.

In the Northern Song Dynasty, the formula for firing porcelain was improved, including kaolin clay obtained locally.

According to the "JDZ Taolu", the raw materials for firing porcelain in Jingzhen are porcelain stones from Qimen, Huizhou Province, and white clay near Jingzhen.

In the Yuan Dynasty, Jingzhen area began to mix a certain amount of kaolin into the billets.

The quality of porcelain is greatly improved by using kaolinite and porcelain stone binary formula to fire porcelain.

It is also because of this formula that the exquisite porcelain that is "white as jade, bright as a mirror, thin as paper, and loud as loud" is created, making Jingci porcelain famous both at home and abroad.

Therefore, it can also be seen from this that in the Yuan Dynasty, Jingzhen specifically mentioned that the kaolin found there should be Macang soil.

The macang clay here is definitely different from the kaolin clay, but the difference is not that big.

Perhaps, the difference is the craftsmanship of the ancients in processing this clay.

Using the same process, the macang clay processed is different from kaolin clay.

And it is on the basis of this dual formula formed by hemp warehouse soil and porcelain stone, combined with Sumali green material, that the Yuan blue and white we see now can be formed under the unique porcelain making technology of Yuan Dynasty craftsmen.

Kaolin itself is very advantageous. After the discovery of macang clay with unique characteristics, the so-called dual formula was formed.

It was with all these technologies that Jingzhen became a kiln dedicated to the palace, and after that, the recipe was kept strictly confidential.

Thanks to this formula, Jingzhen's porcelain-making craftsmanship also developed rapidly, and folk porcelain-making was left far behind.

In the eyes of Westerners, it seems that only gods can do this method of burning stones into white and clean utensils. They have spent hundreds of years, but they have not been able to explore its mystery.

Later, the so-called bone china was fired using animal bones, and finally white glazed porcelain was fired.

In modern times, domestic technology was plagiarized by foreign countries. Slowly, large foreign companies also started firing normal porcelain. At that time, they really mastered the craft of porcelain firing.

Through the development of porcelain, we can see that the use of kaolin must play an important role.

Before the discovery of kaolin, ceramics were only fired with porcelain stones, and the rate of finished products was very low.

The use of kaolin not only expands the source of raw materials for porcelain making, but also changes the performance of porcelain.

From the original single porcelain stone mud to a "dual formula" of porcelain stone and kaolin.

Since then, porcelain has been upgraded from low-fire soft porcelain to high-fire hard porcelain.

This is not only an epoch-making event in the history of ceramics in my country, but also brought a series of major changes to Jingzhen porcelain industry.

Due to its excellent properties, kaolin can be introduced into the porcelain body, which has brought about major changes in the raw materials and technology of Jingzhen porcelain making.

And in the three historical periods of Yuan, Ming, and Qing Dynasties, it has achieved great development and reached a leading position in the world. Jingzhen has also become a world-famous porcelain capital.

(End of this chapter)