A Zisha Teapot is made by high-temperature firing, which causes physical changes and expansion of the pores. After it cools down from the kiln, some of these pores may become blocked with dust. Additionally, during the fine-tuning process by the artisans, small fragments of clay or sand may remain inside the teapot. Moreover, some teapots still contain white aluminum powder (used as a fire-resistant agent to prevent the lid from fusing with the b