Analysis of Small Air Pores, Crackle Patterns, and Glaze Tears in Tenmoku Jian Zhan

Analysis of Small Air Pores, Crackle Patterns, and Glaze Tears in Tenmoku Jian Zhan

The clay body contains numerous small air pores, which significantly enhance the thermal retention of tea and help soften water quality. These pores form during high-temperature firing when iron particles in the clay body migrate outward. The addition of oil wood to the kiln generates carbon monoxide, facilitating the transformation of iron particles into small spots that aggregate into larger patches. The presence of air pores is not a flaw but an inherent characteristic determined by the production process.

Crackle patterns refer to the natural fissures that appear on the glaze surface of ceramics. Two primary causes contribute to this phenomenon: ① During shaping, the directional alignment of clay particles affects molecular arrangement; ② Differences in thermal expansion coefficients between the clay body and glaze result in greater contraction of the glaze layer during cooling after firing.

Glaze tears highlight the thick, flowing glaze unique to Tenmoku Jian Zhan. The droplets concentrate the beauty of the black glaze and its crystalline patterns, embodying the essence of Tenmoku's artistry. However, excessive glaze thickness can cause adhesion to the kiln shelf. Thus, non-sticking glaze tears exemplify both aesthetic appeal and the potter’s masterful technique, which is why seasoned collectors highly prize them.