Blue-gray Mud is a kind of mud made from Duanni raw ore after being aged and processed. After firing, it is off-white or blue-gray, and its color is mostly similar to that of sesame Duanmu. The difference is that the black spots of Sesame Duanmu are more obvious.
The Tibetan Blue-gray Mud in the Blue-gray Mud was widely circulated in the late Ming and early Qing Dynasties. In recent years, due to the small amount of mining, the finished products are very rare.
This mud has a dark purple-gray tone. Because it is full of grains, it feels extremely low to the touch. Players call it "shark skin", which is an embarrassing super-grade mud mine. The texture of blue plaster is delicate, simple and elegant, with high iron content, and the temperature of the brewed tea soup is smooth, sweet and flavorful. At different temperatures, the color varies greatly.
In order to fully display its Blue-gray Mud characteristics, the temperature range is relatively large. Usually, the burning temperature is around 1230°C. Usually, most of the blue-gray works are gray-purple. When the burning temperature of blue stucco is lower than 1200°C, it will be light purple with reddish ash; when the burning temperature is higher than 1200°C, it will appear the obvious feature of blueish gray. Refined cooked mud is finer and more plastic. There is a certain sandiness during the molding process, so that the double-pore structure is obvious after firing, and the air flow is smooth, making tea with it, full of old taste.
The Blue-gray Mud is fine in texture and high in iron content, and the tea soup brewed is gentle, smooth, sweet and flavorful. Like purple clay, it is suitable for brewing green tea, black tea, oolong tea, Pu'er tea, black tea, etc.
