classification
The clay raw materials of the teapot are three kinds of purple mud, green mud and red mud, commonly known as "rich soil". The raw material fired in the teapot is clay, and the clay pot mud is divided into three types: purple mud, green mud and red mud. The mud that can be fired in the teapot is generally hidden under the rock layer and distributes the purple sand pottery between the mud layers of the nail mud. The thickness of the mud layer ranges from several tens of centimeters to one meter. According to the analysis of the lithofacies of the Shanghai Institute of Silicate, the purple sand yellow mud is of the Gaoling-quartz-mica type, with high iron content and the highest iron content of 8.83%. The teapot is fired under high oxygen and high temperature conditions, and is generally contacted by a flat flame fire. The firing temperature is between 1100-1200 °C. The water absorption rate of the finished teapot is greater than 2%. Because it is produced in Yixing, Jiangsu, it is called Yixing Zisha.
chemical composition
The purple sand mud is buried deep under the rock layer and distributed between the mud layers of the mud. The thickness of the ore layer is tens of centimeters to one meter, and its chemical composition is iron-bearing clay siltstone. The main mineral component of purple mud is hydromica, and unequal amounts of kaolinite, quartz, mica flakes and iron. The so-called mountain to eat mountains, relying on soil to eat soil. Yixing purple mud, for thousands of years to raise a generation of skilled craftsmen, so that when it comes to the teapot, we immediately think of Yixing. Whether the purple sand pot made Yixing famous, or Yixing made the purple sand pot famous, and it is unclear who can test it.
Production process
As follows: The purple mud extracted from the mineral layer, commonly known as raw mud. It is like a block rock, which is weathered by the open air, so that it is loose, and then it is crushed by primary crushing and crushing according to the number of particles required by the product. The screened ash is stirred into a piece of mashed mud by a mixer, piled up in a stale treatment, and then the septic mud is vacuum-trained, so that it becomes a mature mud for the billet. In the process of purple sand mud training and preparation, the water quality of the water used is very particular. The quality of the water quality will directly affect the quality of the product. The purple sand mud has good plasticity, high green strength, and the drying and firing shrinkage rate of the blank is small.
In order to enrich the appearance and color of the purple sand, to meet the requirements of process changes and production design, the craftsmen boldly carry out technological innovation, mixing several kinds of mud materials with different ratios, adding moderate metal oxide colorants to the mud. Control the temperature and atmosphere in the kiln. After the product is fired, it will be bright, not purple, or red, not red, or green, not tender, or yellow but not delicate, or gray, not dark, or black. ink. The color of the purple sander is like the color dyed on the wool textiles, calm and without fire; carefully observe, all kinds of mud color wrapped with stars white sand, such as silver powder, is a light map, like a pearl. Sometimes it is more eye-catching in the mud and with coarse mud or steel sand. In recent years, it has also succeeded in the successful production of red and bronze-coated toppings with natural luster, and the new face of mud-colored decoration. Purple sand pottery, referred to as purple sand, also known as purple sand or purple sand pottery. Purple sand tea set, simple and generous, simple and quaint. With its tea, the longer it is used, the more the body color will be more radiant and luxuriant, the more mellow the tea soup will be, and even the boiling water in the empty pot will have a light tea fragrance. According to scientific analysis, the teapot does retain the original taste of the tea soup. It absorbs the tea juice and has the characteristics of resistance to cold and heat.
Bath fire discoloration
The purple sand pot is not necessarily purple. After firing at high temperature, it presents a variety of wonderful colors, such as cinnabar red, jujube red, copper, sea bream red, iron ash lead, sunflower yellow, dark green, blue orchid and so on. The teapot is not glazed, but it is more glazed, and the color changes are wonderful and colorful. Such as cinnabar purple, shrub, bean green, jellyfish, flashing color, etc., are natural primary colors, simple and honest, quaint and lovely. The calcined teapot is ideal for heat preservation and breathability. It is an ideal tool for tea. It is not exaggerated in the society to call it "the world's tea set is called the first".
Legend of rich soil
According to legend, in the ancient times, the streets of Yixing, suddenly one day people rushed along the street: "Selling rich soil! Who buys rich soil? If you buy, you can make a fortune." So named.
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