梦溪笔谈
There was another prestigious family of Wuxi, Jiangsu province, who engaged in metal type printing. This was the An family, most notably that of An Guo (1481–1534). However, the An family's printed works came shortly after the Hua family, the latter of whom were supposedly inspired by Shen Kuo's description of Bi Sheng's movable type in the "Meng Xi Bi Tan" (Dream Pool Essays) of 1088 AD. Yet the process of earthenware movable type and metal movable type are different, as metal movable type required many more complex technical processes of engraving, casting, type-setting, inking, and printing.