My system is not decent

The glaze firing process of Ru porcelain is still very important. The main method is to immerse the entire biscuit-fired carcass in glaze water with a moderate concentration, and use the water absorption of the carcass to absorb a certain thickness of the glaze layer.

This method can make the thickness of the glaze layer of the utensils tend to be consistent, and the operation is relatively simple and convenient.

Because the glaze has a certain viscosity, after the glaze is dipped, the glaze that is not completely absorbed is likely to remain on the edge of the utensil.

When the utensils are turned over and left to stand, this part of the glaze will gradually dry, forming a relatively thick glaze layer on the edge of the mouth or the bottom foot.

Traces of this kind of craftsmanship can be seen in handed down and unearthed utensils.

Of course, there is no sign of multiple glazes on the cross-section of the Ru porcelain specimen.

This proves that the glazing process is still a single glazing process, and the main factor for the increase of the thickness of the glaze layer is the increase of the alumina content in the glaze.

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With the increase of alumina content in the glaze, the high-temperature viscosity and melting temperature of the glaze both increased.

This facilitates the formation of a thick glaze, which creates a fat-like jade effect.

Glaze firing is the last and crucial step in the porcelain making process of Ru Kiln.

The quality of glaze firing will have a very intuitive impact on the quality of Ru porcelain.

The kiln structure and the use of kiln furniture are the material basis to ensure the smooth progress of glaze firing.

During the glaze firing of Ru kiln, a series of firing indicators, such as the heating and cooling process and redox atmosphere in the kiln, are called the firing system.

The firing system has left traces of craftsmanship on Ru kiln products. We can see the ancients' precise grasp of the firing system through the traces of craftsmanship.

After the firing is completed, the porcelain will open in the process of natural cooling.

The crack in the glaze layer is actually a defect of the ceramic glaze.

But on the contrary, in the eyes of literati in the Northern Song Dynasty, this defect has a unique aesthetic feeling and has become one of the characteristics of Ru porcelain.

Glaze grains, also known as cracks, are cracks in the glaze layer caused by the different expansion coefficients of the glaze during the firing process of porcelain.

The appearance of cracking is itself a defect in the firing process.

The perfect combination of tire glazes should have the same expansion coefficients, so that the glazed surface has no cracks.

However, this stunt, which was difficult to achieve in the Song Dynasty, was generally impossible to achieve the level of no opening due to the relationship between materials and firing techniques.

Among the Ru porcelain handed down from generation to generation, the only piece of non-patterned ware is the sky-blue non-patterned narcissus basin hidden in the Wanwan Forbidden City.

This cultural relic of the Song Dynasty became an alternative among porcelain because of its flaws, and later became a national treasure among national treasures

This is a legendary piece of porcelain, which was born in Ru Kiln in the Song Dynasty of our country.

It once entered the palace for royal use only, and it even has a story with Emperor Qianlong that has been passed down to this day.

The real reason why it became a national treasure among national treasures is precisely because it was once a substandard product.

Will unqualified products become national treasures?This is impossible, really possible.

my country's most famous porcelain, in the Song Dynasty.

Guan Kiln, Ge Kiln, Ru Kiln, Ding Kiln, Jun Kiln, the five famous kilns are world famous.

"Song porcelain is the best in the world", and "Ru kiln is the first".

This Ru kiln, which ranks first among the five kilns, was originally produced in Ruzhou.

At that time, Zhou Shizong Chai Rong ordered people to burn a kind of porcelain, called Chai kiln, which was the earliest Ru porcelain.

However, Ru porcelain has two characteristics that are different from other porcelains. One is that the glaze color is peculiar, between blue and green, just like the first touch of blue exposed after the rain has passed and the dark clouds have dispersed.

After the rain, the sky is clear and the clouds are broken, and the color of the sky is the future. This is Ru Kiln.

Another unique feature of Ru porcelain is that during the firing process, due to the difference in expansion between the carcass and the glaze, the fired Ru porcelain will naturally form fine and uniform cracks.

Usually, we call it open film, and people also evaluate the quality of Ru porcelain according to the situation of open film.

In the Northern Song Dynasty, thanks to the obsession of the artist emperor Huizong, Ru porcelain was more concise and beautiful in style.

The color is more elegant and quiet, and the glaze is more moist like jade.

So far, Ru porcelain has successfully defeated all opponents and reached the peak of ancient Chinese porcelain.

However, what is unexpected is that only at the end of the Northern Song Dynasty, due to the invasion of the Jin soldiers, the Ru kiln and Ru porcelain were completely destroyed, and the extremely exquisite Ru porcelain refining skills were lost since then.

So far, every piece of Ru porcelain handed down from generation to generation is a national treasure.

And the sky blue narcissus basin we are going to talk about today is now hidden in the Wanwan Forbidden City.

This cerulean narcissus basin with no patterns is similar to the wooden basins of the Song Dynasty. Its outline is simple and elegant, and the whole body consists of only a few straight lines.

Several perfect curves form the same simple plane.

It is dignified, warm and elegant.

It not only inherits all the advantages of Ru porcelain, such as simple and smooth shape, light and cool sky blue glaze, but the most unique thing is that it has no cracks in the whole body, which is definitely an alternative to Ru porcelain.

At present, among all the Ru porcelains in the Northern Song Dynasty in the world, there is no open piece, only this one.

The magic of this azure and patternless narcissus basin is far more than that. There is also a legendary story attached to this special piece of Ru porcelain.

This celestial blue narcissus basin without patterns, born in the Northern Song Dynasty, was thrown into Ouchi's warehouse perhaps precisely because it was not opened, and it was an unsuccessful piece of Ru porcelain.

Because of sitting on the bench, I escaped the flames of war and destruction again and again.

In the blink of an eye, in the Qing Dynasty, no one cared about the existence of the Tianqing Wuwen Narcissus Basin.

It was randomly placed in the corner of the treasury, covered with dust.

That year, Emperor Qianlong occasionally found two kittens at the corner of the palace.

He felt that the two kittens were a bit pitiful, so he ordered the eunuch to build a nest for them.

The emperor opened his mouth, and the eunuch broke his leg.

The cat litter was set up quickly, but there was no pot to feed the cat.

This was absolutely impossible, so one of the eunuchs came to the treasury and asked the eunuch guarding the treasury for a cat food bowl.

Who dares to be sloppy with the emperor's errands.

The eunuch guarding the treasury opened the door, and gave the dusty sky-blue narcissus basin to the eunuch who built the cat's nest.

Half a month later, Emperor Qianlong suddenly remembered the two kittens.

He came to the scene to check, and found that the azure narcissus basin had been licked by the cat until there was no dust left.

Although there are still cat food residues hanging on it, but under the light of the eyes, there is a breathtaking "precious light".

The unopened sky blue and grainless narcissus basin is, logically speaking, a defective product.

Because of its uniqueness, it has become a unique masterpiece in the world.

This "defective product" of Ru kiln did not become depressed or give up on itself because of others' scorn.

It waited "silently" for hundreds of years, and finally waited for "Bole" to appreciate itself, although it was in the form of a cat food bowl.

The Tianqing Wuwen Narcissus Basin was placed in front of Qianlong as a treasure.

Qianlong also wrote a poem for him: "The official kiln can't distinguish between the Song Dynasty and the Tang Dynasty, and there is no fire to keep the light. It is rumored that the food utensils, but Cuping knows how to repay the kindness (the cat knows how to be grateful to the owner when he grows fat). "