Duan Mu is a type of purple sand clay, and when it's used to make teapots, it's referred to as "section clay" or "Duanzi" teapots. This kind of clay can be broadly categorized into three types: original section clay, aged section clay, and distributed section clay. Aged section clay refers to the original ore that has been left to age for some time, allowing its properties to mature and develop unique characteristics.
In the context of Duan Mu, there are also special blends like the "sesame section," which involves mixing purple sand particles into the green clay of the same region. The purpose of this blend is to enhance the visual texture of the clay. In recent years, many tea enthusiasts have developed an interest in these types of clays, particularly because of the way they transform during firing. It’s not just about aesthetics—it’s about how the final result looks and feels. Personal taste may vary, but the quality of the material and the craftsmanship always stand out.
One of the key qualities of high-quality Duanzi teapots is that the purple sand particles are subtle and not overly visible. Instead, the color appears to shift naturally within the green clay of the mountain, creating a layered effect that resembles jade. Duan Mu is known for preserving the natural green hue of the clay, which tends to be very pure and bright yellow. This type of clay is widely used in pottery production, especially for making teapots. When fired, the purple sand changes in both color and texture, offering a variety of effects such as sand adjustment. Understanding these characteristics can help distinguish a genuine Duanzi teapot from others.
First, look at the color. Pure purple sand should display a jade-like luster, whether it's purple, yellow, red, or a mix of colors. The surface should feel smooth, almost oily, and it shouldn’t require waxing or polishing. Think of the appearance of old jade—rare materials are more valuable due to their limited availability and unique beauty.
Second, listen to the sound. A well-made teapot should produce a soft, muffled sound when tapped, similar to the tone of traditional pottery. It shouldn't be as sharp as metal or porcelain. A hoarse or deep sound indicates good air permeability and that the clay hasn’t fully crystallized, helping to preserve the aroma of the tea without altering its flavor.
Third, feel the texture. The surface should be smooth and rounded, with a comfortable grip. While there may be small particles, they should be evenly distributed and not rough. The purple sand particles are typically between 32-60 mesh, and the handcrafted processing method gives a different feel compared to machine-processed sand. This distinction is important for identifying the authenticity of the piece.
Fourth, observe the aging process. High-quality purple sand teapots will gradually change over time as they are used and rubbed. After a few sessions of brewing tea and dry rubbing, the surface becomes matte yet oily, with the color deepening over time. The longer it’s used, the more it develops a unique aura, reflecting the bond between the pot and its owner.
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