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1, Macang soil (produced in Jingdezhen Macang Mountain) firing porcelain looks more chromatic than the kaolin white in the gray degree of gray, the color is white in the gray and slightly green, the tire quality looks loose, easy to crack, in the vessel often cracked (kiln crack traces), outside the vessel also often appears on the mouth of the glaze, the body of the vessel has kiln cracks or kiln sealing caused by the phenomenon of glaze reduction and lack of glaze, some are very regular, there is no such phenomenon, some porcelain unearthed in the bottom foot of the exposed tire and the glaze inside the vessel will appear dirt and cracks, This kind of cracked vessel is composed of vertical cracks (many) and lateral cracks (very few), and the bottom shows a hole and nest like a brick for construction caused by scraping the bottom, and the hole and the scraper direction become a vertical crack at a ninety-degree angle, that is, a vertical crack with the knife method in the direction of the knife when scraping. Most of them have spinning marks, jumping knife marks, and some are indeed irregular without holes. The bottom foot tire color of the regular device is mostly white and grayish and slightly green, and this device is often a fine piece of Cardinal porcelain or the Hongwu before the end of the Yuan and the beginning of the Ming Dynasty, also known as yuan dynasty official kiln porcelain, because the cardinal porcelain was burned by the privy council of the military institutions of the Yuan dynasty. This is mainly caused by the proportion of macang soil in the clay used in the Yuan Dynasty accounting for between 25-40% of the Yuan porcelain. (Due to the difference in the composition of kaolin in clay) At that time, the proportion of clay was not mature, and the proportion comparison was not very stable.
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2, the color white of the kaolin color is basically not green, and the degree of gray is not as good as that of macang soil, and the silicification degree is good, which is an important difference basis in the ophthalmic observation of kaolin and macang soil. (It should be said that the more organic kaolin contains, the heavier its gray and green color)
Kaolin porcelain in the exposed tire of the bottom foot and the tire color in the vessel is obviously different from the Macang soil, basically it can be said that the kaolin porcelain is white in the slight gray, there is crystal silicification, the degree of porcelain white porcelain is high, the porcelain tire of the Macang soil is white and gray, the degree of silicification porcelain is not as good as kaolin, cracking is very rare, cracking is not vertical cracking in the direction of the knife, but cracking and cracking of poor mud training. Some of the kaolin processed porcelain have a layer of tire mud applied to the bottom foot after the tire is made, which is rough cracked due to different temperature coefficients. The bottom of this crack is called a rough bottom. The state of this crack is not the same as the state of the Macang soil crack. However, the main reason for the cracking of porcelain in the Yuan Dynasty is caused by the difference in the proportion of porcelain clay and clay, not caused by the difference between Macang soil and kaolin clay. These differences are the key to distinguishing kaolin and Macang soil, not the basis for distinguishing Yuan Dynasty porcelain, because the Yuan Dynasty kaolin, each kind of soil is used, but it can be distinguished from the false and false Yuan Dynasty fetal soil, because the yuan dynasty fetal soil and later dynasties are different.
In terms of the smoothness of the tire, the porcelain tire bottom made of the Yuan Dynasty Macang soil and kaolin clay has the characteristics of looking rough and slippery, but if the proportion of kaolin and porcelain clay is changed, the degree of smoothness and roughness also changes, the above two changes in the Hongwu period at the end of the Yuan And the beginning of the Ming Dynasty, which is mainly due to the change in the proportion of the tire soil, which causes changes in the sense and touch of the porcelain tire. The fetal soil hemp warehouse soil and kaolin clay of Jingdezhen porcelain in the Yuan Dynasty are a kind of kaolin, and the early Yuan Dynasty used hemp cang soil, and the late period also used kaolin. Macang soil, kaolin in the world collectively known as kaolin, kaolin soil has different compositions, the nature of a mine a kind of kaolin, mountains are different.