Black glaze

 
Celadon glaze
Black glaze
White glaze
 

 

 

Black glaze

  Black glaze is divided into two kinds in the ancient times. One is lime glaze, the other is lime- alkali glaze. The black glaze in the early period of Donghan and Dongjin are all belong to the lime glaze. But after the Tang Dynasty, the lime-alkali glaze was begun to use basically. According to the variety of the black glaze, they are divided into two kinds: the common black glaze and the colored black glaze. The colored black glaze includes oil-spot glaze, hare's fur glaze, turtle shell glaze, sesame paste glaze and so on.

 

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Oil-drop glaze

  Oil-drop glaze is one special variety of the black glazes. The characteristic is that many small dots possessing silver grey metal luster scatter on the cover coat. They are differed in size. The big one is several millimeters in diameter and the small one is only as big as the point of a needle. Their shape just like oil-drop. Therefore, it is called "oil-drop glaze". Oil-drop glaze belongs to the crystalline glaze. When it is fired, the oxide of the iron centralized here. But these parts forms supersaturation state when it is cooled. Moreover, there are crystals separated out in the form of sanguine and magnetite. Therefore, it forms "oil-drop" spot.

  The oil-drop glaze is first fired in the Song Dynasty. Judged according to the products handed down from the ancient times, this kind of black glazed ware possesses typical characteristic of the Jiang ware. But this kind of ware is not unearthed from the kiln site. On the contrary, they are unearthed from the "dingyao", Hebi kiln and Linfen kiln in the North. Among them, the products unearthed from the Lin Fen kiln are the most. The oil-drop crystallized spots on the Ding ware and Hebi ware are very small. But they possess strong silver lustre.

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Hare's fur

  The stripe of the yellowish brown or iron rust is appeared on the surface of the black glazed ware. Its shape like hare's fur. Therefore, it is called hare's fur spot. Hare's fur is the rare variety of the black glaze. During the process of firing, the air bubble in the glaze brings the iron element to the cover coat. The part containing rich iron element flow to the stripe shape as the running of glaze at the high temperature of 1300 centigrade. The small crystals are separated out when it is cooled. This

kind of small crystal is sanguine. Therefore, it forms gorgeous hare's fur spot. The hare's fur has already emerged at the beginning of the Song Dynasty. "yuhao", "yihao", hare's fur spot, "tuhejinsi" and so on are often mentioned in the poems of the successive dynasties. They are different names of the hare's fur. The black calyx with hare's fur design is fired at many porcelain kilns in Fujian Province. Therefore, it is called hare's fur calyx. Among them, the products made in Jiayang kiln are the most famous. The hare's calyx is also fired at some porcelain in Jianxi, Sichan, Shanxi and other places. But the number of the products less than the products made in Fujian.

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Turtle shell glaze

  Turtle shell glaze made in Jizhiou kiln. The cover coat is mingled by black, yellow and other colors. Its color tone is soft. The body of the turtle shell glazed ware is made of the porcelain clay containing little iron content. Then, it is glazed on the green body. After it is fired in the kiln, the glaze possessing different swell factor is coated on the body. Moreover, it is fired again. It forms the stripe of the tortoise-shell in black because of the chapping, flowing, intensive and joint of the cover coat. Therefore, it is called turtle shell glaze. The specimen imitated turtle shell glaze made in Jizhou kiln has been found in the Guangxi area besides Jizhou kiln.

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Partridge feather spot

  Partridge feather spot is also a kind of crystalline glaze. Two kinds of black glaze containing different iron content are glazed on the green body twice. Then, it is fired by the temperature lowing slightly to other crystalline glazes. Because there are a lot of iron elements crystallized in the glaze, the black cover coat takes on design like the feather of the partridge. Therefore, it is called partridge feather spot.

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