Why does Jun porcelain have cracks, why are there cracks on porcelain

Porcelain for daily use has open pieces.

It affects the service life - because you have to use it every day, wear and wear, but Jun porcelain.

Generally, it is not used for daily life, but as a collection, so Jun porcelain has become a way of art appreciation, a means of beautification and decoration, and can give people a sense of beauty.

The lines of Jun porcelain are criss-crossed and intertwined, which is very charming. Common opening patterns include ice cracks, garbage crumbs, caviar patterns, cow hair patterns, and spider webs.

veins, leaf veins, etc. Jun porcelain opening time is different in the morning and evening, some out of the kiln when a large number of pieces open, the pieces are small and dense, and some days later to see the pieces. With the extension of time, Jun porcelain will continue to open, but the speed will slow down, and in a few years or even decades, a crisp opening sound will occasionally be heard.

The reason for the opening of the glaze is that the expansion coefficient of the tire and the glaze does not match, the cooling process after the firing of Jun porcelain, the glaze begins to shrink, with the decrease of temperature, the difference between the glaze shrinkage is getting bigger and bigger, the glaze shrinks more, the tire shrinks less, so that the glaze produces a tensile stress, resulting in glaze cracking (from the point of view of appreciation, it is generally not considered to be a defect), on the contrary, the less. If the expansion coefficient of the glaze is less than the expansion coefficient of the tire, the glaze will not open (daily necessities.

This type of porcelain should be chosen).

The kiln did not open, but there may be earthworms walking mud kisses, because the lines are like earthworms crawling in the mud after a rainy day, so it is called earthworms walking mud patterns. In the past, it was often used as an element of identification, but now it can't, and the earthworm mud pattern can now be imitated, and it must be comprehensively identified. Hope!

The characteristic of Jun porcelain is that it is one color into the kiln and ten thousand colors out of the kiln. It does not form natural cracks.

There are cracks, who told you that? It won't be "earthworms walking mud patterns"!

Porcelain cracks are caused by the damage of porcelain by external forces, and the other is a specialty of porcelain manufacturing.

The art form is called ice crack porcelain. It is a traditional porcelain of the Han nationality. Ice crack, also known as Xuan, is a manifestation of the internal stress of the porcelain itself, only when the internal stress is unbalanced in the normal state, unable to maintain the existing state, and the degree of expansion and contraction of the glaze exceeds the limit of its elastic range, the glaze layer will be fractured and displaced, until the internal stress is balanced, thus forming a macroscopic ice crack effect.

There is no fixed moment for this phenomenon, because it is directly related to the expansion coefficient of the two, so the temperature difference changes the most when the porcelain is out of the kiln, and the effect is the most obvious.

The opening pattern is a kind of cracking phenomenon on the glaze surface that is constantly formed during the firing process of the furnace fire or after the kiln due to the different expansion coefficients of the tire and glaze heating and the squeezing of the porcelain in the firing process.

The opening of the Ru kiln is very unique, and it is also as rich and colorful as the glaze of the Ru kiln, and the ancients left a lot of titles, and the image, such as caviar pattern, ice crack, crab claw pattern, fish scale pattern, etc., the opening of the Ru kiln is closely related to its unique process and formula. Ru kiln lime glaze, glaze thin and uniform color, and agate into the glaze, the glaze is warm, jade texture is strong. When the kiln is out of the kiln, there is a large opening (hereinafter referred to as the main line), and it is still continued after the kiln.

Continue to open the piece, but are all small open pieces (hereinafter referred to as the secondary line), the secondary lines are within the main line, will not be out of the main line, and form a grid in the two main lines, the grid is large and small, the opening is deep and shallow, and some of the opening is oblique and white**.

I think it's because of the characteristics of other people's firing, so it's different.

Ru porcelain crack jargon is called open piece, a characteristic of Ru porcelain.

Blue and white porcelain, also known as blue and white porcelain on white ground, is often referred to as blue and white, and is a treasure of Chinese ceramic firing technology. It is one of the mainstream varieties of Chinese porcelain, which belongs to underglaze colored porcelain. Blue and white porcelain is made of cobalt ore containing cobalt oxide as raw material, depicting ornamentation on the ceramic body, and then covering with a layer of transparent glaze, which is fired at one time by a high-temperature reduction flame.

The cobalt material is blue after firing, and has the characteristics of strong tinting strength, bright color, high firing rate and stable color. The original blue and white porcelain has been seen in the Tang and Song dynasties, and the mature blue and white porcelain appeared in the Hutian kiln in Jingdezhen in the Yuan Dynasty. In the Ming Dynasty, blue and white became the mainstream of porcelain.

During the Kangxi period of the Qing Dynasty, it reached its peak. During the Ming and Qing dynasties, it also created and burned blue and white five-colored, peacock green glazed blue and white, bean green glazed blue and white, blue and white red color, yellow ground blue and white, brother glaze blue and white and other derivative varieties.

Ru kiln porcelain is one of the five famous porcelains of the Song Dynasty in China. The head of the famous porcelain, Ru kiln is the best. The craftsmen of the Ru kiln glazed the precious agate and fired it into a possession"Blue as the sky, the face is like jade, the cicada wing pattern, the morning star is scarce, and the sesame nail glaze is satisfied"Typical features of Ru porcelain.

It is said that the opening of the Ru kiln is naturally formed when the kiln is released.

Originally, porcelain cracking was a defective product in the process of porcelain firing, but later people mastered the fine number of cracking, cracking to a certain extent in the glaze, and the embryo density was smaller than that of the fetus and extended cracking, forming a kind of artificially controlled texture on the porcelain decoration. Before the Ru kiln was used, the glaze ice cracks were faintly visible. After raising, you can see the exquisite opening film.

Jubaolong Ru kiln is the closest to the opening of the imitation Song Ru kiln.

After a long time, it may appear, so be careful to save it.

Natural opening during firing.

The surface of Jun porcelain is cracked, can it be considered a defective product by hand?

When you get a piece of slag porcelain, first observe whether there are flaws in the workmanship. The common defects of Jun porcelain are:1

The shape is clearly deformed; 2.There are obvious mud, blank bubbles, and bulges on the surface of the mold, and it is obvious to touch the digging brother with your hands; 3.glaze flows over the sole 1 2 more; 4.

There are obvious pits on the surface that leak out of the carcass; 5.There are small holes on the surface that obviously affect the artistic effect; 6.There is obvious lack of glaze on the surface and leakage out of the carcass; 7.

There are obvious and prominent impurities on the surface; 8.The glaze has obvious scratching bubbles; 9.Obvious cracking of the carcass; 10.

glaze damage caused by bumps; If any of the above defects exist, and it is obvious that it has seriously affected the aesthetic effect of art, then it is defective and worthless!

Yuzhou Shenhou is known as "Jun Capital", Yuzhou's Jun porcelain, is one of the five famous porcelain in China, known for its "one color into the kiln, out of the kiln ten thousand colors". The name of Jun porcelain, derived from the history of Yuzhou was once the capital of China's first slave dynasty - the Xia Dynasty, the son of Yu Qi had a banquet in Juntai here, the princes of the world, held a grand opening ceremony. The name of Jun porcelain, it began in the Tang Dynasty, flourished in the Song Dynasty, and experienced the Yuan, Ming, Qing Dynasty until today, in this 1,700 years of history, it has always shined with a gorgeous and dazzling brilliance, favored by the world, especially since the Song Dynasty, Jun porcelain has been set by the royal family as a royal treasure, can only be used by the royal family, not allowed to be collected by the people, enjoy the reputation of "priceless Jun priceless", "even if there is a family property, it is not as good as a piece of Jun porcelain", "Yatang no Jun porcelain, can not boast of wealth", Jun porcelain its ornamental value is high, The great charm of art has conquered generations of Chinese descendants.

The reason why Jun porcelain is precious is first of all because of its unique soil, water source and climate in the territory of Yuzhou Shenhou. There are not only the precious ores of Dalong Mountain, Fengyin Mountain, peacockite, tofu stone, agate rock, tiger skin green and unique soil quality of Dalong Mountain, Fengyin Mountain, but also the unique Yinghe water ingredients containing the essence of nature, coupled with the warm temperate monsoon climate, the sunshine is sufficient, and the four seasons are distinct. In this way, the rich soil of mineral deposits, by the freezing of the cold wind, the softening of the spring warmth, the exposure of the summer sun, and the infiltration of the autumn rain, have formed the unique resources of firing Jun porcelain in Yuzhou.

Self-made five-color porcelain clay, ten-color glaze, the fired Jun porcelain fetus is pure, solid and delicate, the glaze is natural, milky crystalline, gorgeous and colorful, and it is very poetic and picturesque. The second is its "kiln becomes unique, Jun porcelain is not right". Whoever owns any piece of Jun porcelain will have the world's unprecedented "uniqueness".

The third is the opening sound of Jun porcelain, which is like a piano and a ling, and the ice cracks that crisscross it make its glossy enamel more pervasive. The fourth is its firing "ten kilns and nine no".

The gods, wonderful, wonderful, and unique of Jun porcelain, throughout the ages, have attracted countless Chinese and foreign celebrities and scholars, and dignitaries from all walks of life to come for sightseeing and enjoyment. New Zealand friends call it "no matter where it is placed, everything suddenly increases", "potter stunts, take my poetic soul". Calligrapher and painter Han Meilin praised it as "the soul of China".

Nowadays, the Jun porcelain used by the imperial palace in the old days has become a high-end gift for wealthy magnates and connoisseurs to purchase and give to VIPs. In 1997, the people of Henan Province welcomed the return of Hong Kong, and specially made a large 1997 mm high porcelain vase symbolizing the meaning of "auspicious Ruiying, Taiping has an elephant", which is now collected in the Hong Kong Return Hall.

Yuzhou Shenhou Jun porcelain street and Junguan kiln site museum have been included in the national ceramic tourism line. Here you can not only enjoy the treasures and wonders of Jun porcelain in the past dynasties, but also make pottery souvenirs by yourself, and anyone's works are absolutely unprecedented, unparalleled in the world.