Zi Collection, Middle Volume Radical: Metal (jīn) Page 1348, Entry 07 The "tiě" character is recorded in "Jiyun" as being written as "䥫" in ancient times. Detailed annotation can be found under the thirteenth stroke. "Baopuzi · Jindan Volume" records: Stir it with an iron spoon for ten days, and it will be restored to cinnabar.