Legend has it that one night I dreamed that I had a large sum of money in my hand, dipped it in Jun porcelain and washed it, drew a green drum, and scribbled on the drum surface. Suddenly, beautiful and elegant, vigorous and free and easy fonts appeared on the drum surface. When Hui Zong woke up, he told this dream to all the ministers. Sheng Da Palace praised Zhou Bangyan's mastery of temperament, which was very popular with the Sect. He said to his dream, "the brush used in the emperor's dream is Jun porcelain treasure wash, and there is a paste pen on the drum." This is just taking aura in the drum, collecting rhythm in the music and melting in the washing. That drum will get what you want. As long as Yang Zhai (now Yuzhou) is allowed to burn this kind of utensils, the emperor can write beautiful fonts with it. " Hui Zong was overjoyed and ordered Yang Zhai officials to supervise the brush washing.
The kiln supervisor ordered the top kiln maker in Yangzhai to make it. The kiln workers worked hard and finally made a beautiful pen wash: the following three wishful feet, each with a circle of drum nails on the upper and lower edges, did not add water when washing, and kept looking watery. This Jun porcelain pen was sent to the palace. When Huizong used it, the paste pen didn't need to be filled with water. Every time he used it, he could hear the gentle drums, and the written words were self-contained. It was the later "thin golden body".