What causes the opening of porcelain?

The introduction is simple, write the main one, so that people can see it clearly, and there are too many complicated questions to remember.

Introduce the reasons for the opening of old porcelain.

From the point of view of technology, it will be more difficult to fire in the Ru kiln without opening the piece.

Chip opening is a phenomenon of Ru kiln, and there are two reasons for cracking: one is that the billet mud extends in a certain direction during molding, which affects the arrangement of molecules; Second, the expansion coefficient of billet and glaze is different, and the shrinkage rate of the glaze layer is large when there is no mold and cooling after roasting. The opening piece was originally a kind of defect in porcelain, but the original one kind of defect became another kind of defective beauty.

From the reason for the opening of Ru porcelain, we can know that the ware that does not open the piece must ensure that the glaze and the expansion coefficient of the fetal soil are exactly the same, in this regard, the firing of the unopened piece is more difficult and more precious.

Origin of porcelain:

Porcelain is made of porcelain stone, kaolin, quartz, mullite, etc., and is covered with a glass glaze or painted surface. The forming of porcelain is to be fired at high temperature (about 1280 1400) in the kiln, and the glaze color on the surface of the porcelain will undergo various chemical changes due to the difference in temperature, which is a treasure of Chinese civilization.

China is the homeland of porcelain, which is an important creation of the ancient working people. Xie Zhaoqian recorded in "Five Miscellaneous Works": "Today's common saying that the kiln is called the magnetic ware, and the kiln in Cizhou is the most, so the name is extended, such as silver is called Miti, ink is called Mi Mi, and so on."

At that time, the emergence of the excavation of the age of "magnetic" instead of kiln was caused by the largest output of Cizhou kiln. This is the earliest historical material found to use the title of porcelain.

The opening is a natural cracking phenomenon of porcelain glaze, and color is one of the main decorative techniques of ceramicsIt is made of various colored materials to paint various decorations on the glazed surface of porcelain that has been fired, and then enter the kiln for the second time and solidify the colored materials at low temperature, usually including painted porcelain, colored porcelain, blue and white porcelain, colorful porcelain, pastel porcelain, colored ground painted gold porcelain and enamel color.

There are two reasons for cracking: the slime extends in a certain direction during molding, which affects the arrangement of molecules; The expansion coefficient of billet and glaze is different, and the shrinkage rate of the glaze layer is large when cooling after roasting.

Therefore, cracking was originally a disadvantage in porcelain firing; However, people have mastered the law of cracking and made the open glaze (i.e., crack glaze), which has become a special decoration for porcelain. The Ru, Guan, and Ge kilns of the Song Dynasty all have this kind of product. It is most famous for the products of the Song Dynasty kiln.

The opening piece is also known as ice crack, according to the color of eel blood, gold wire iron wire, light yellow caviar pattern, according to the shape of the net pattern, plum pattern, fine broken pattern, etc.

There are two kinds of pieces of the official kiln of the Song Dynasty, the large open pieces are long and stout, and some of the lines are on the porcelain from top to bottom in the warp line to the end, like a cow's hair hanging on the buttocks, there is a "cow's hair pattern" said.

The porcelain with small pieces of porcelain also has a few longer and thicker lines. The color of the marks is mostly eel blood, roe yellow, ink, putty, and eel blood. Differences in tire color.

The tire color of the official kiln of the Song Dynasty is gray-black or dark gray (purple gray), and the uniform color is dark black, and the formation of its famous "purple mouth iron foot" characteristic is completely due to the tire color.

The imitation Song official kiln ware of Yongzheng has a tire color of white, gray-white and light gray, and such a tire color cannot form a purple iron foot in the thin glaze of the mouth and the exposed tire at the root. Differences in the soles of the feet. The official kiln of the Song Dynasty has two kinds of full glaze wrapped foot support firing and foot root exposed tire pad burning, the former has nail marks at the bottom, and the latter foot root exposed tire is an iron foot, the foot tire repair is relatively rough, and the bottom has no style.

In addition to the sauce glaze applied to the root of the foot, the Yongzheng imitation Song official kiln is very fine and regular.

It's good not to open the film.

Open piece is a ceramic term that we have become very popular today. In the past, we didn't understand when we met the opening film, for example, in the early years, some people said that they had a bottle called fried porcelain. Fried porcelain is full of open pieces on it, called fried porcelain.

The opening is a very important phenomenon in Chinese ceramics, and the earliest porcelain has the phenomenon of opening the piece. Then it is a long process for the opening film to go from a meaningless phenomenon to a meaningful pursuit. This process is an indispensable lesson in the aesthetics of Chinese ceramics.

If we take ancient porcelain as the standard, then most of the ancient porcelain has open pieces.

Our modern porcelain can be controlled very well, and when the control was not good in ancient times, most of the porcelain had the phenomenon of opening pieces. For example, the blue and white porcelain we know today, blue and white porcelain in the Yuan Dynasty, in the early years of the Ming Dynasty, a large number of blue and white porcelain had open pieces.

The difference between opening and not opening

1. The main differences are: in the form of opening: Ru kiln mainly produces celadon, and its porcelain opening is like crab legs, commonly known as "crab claw pattern", while the brother kiln is basically caviar pattern.

2. On the color of the opening piece: the color of the Ru kiln is elegant, and the brother kiln is a black and yellow gold wire.

3. On the shape of utensils: The utensils of the kiln mainly include plates, bowls, bottles, washes, etc. The utensils of Ru kiln mainly include plates, traces, bowls, bottles, washes, respects, lamp holders, narcissus basins, etc.

You can check it. The opening refers to the opening of the glaze of porcelain, which is actually due to the age or the different stresses in various places when stored in the soil, resulting in small cracks on the glaze. The glaze is cracked, but the porcelain is not cracked.

Sometimes it affects the beauty, sometimes it is not a big problem, and sometimes it is used to become a kind of beauty.

<> porcelain opening refers to a natural cracking phenomenon of porcelain glaze. There are two reasons for the split: first, the billet mud extends in a certain direction during molding, which affects the arrangement of molecules; Second, the expansion coefficient of billet and glaze is different, and the shrinkage rate of the glaze layer is large when the cooling is after roasting.

Therefore, cracking was originally a shortcoming in porcelain firing, but people mastered the law of cracking and made an open glaze (i.e., crack glaze), which became a special decoration of porcelain. The Jun, Ru, Guan, and Ge kilns of the Song Dynasty all have this kind of product. The opening piece is also known as ice crack, according to the color of eel blood, gold wire iron wire, light yellow caviar pattern, according to the shape of the net pattern, vertical trembling plum pattern, fine broken pattern, etc.