Zhao Ce-yi in the Warring States Policy: "It is well known that Zhao Xiangzi killed Zhi Bo, and Yu Jean, a guest of Zhi Bo, attempted to assassinate Zhao Xiangzi. I screamed and painted for him, ruined my eyebrows, and killed myself to change his face. Begging, begging. His wife didn't know, and said, "It's not like my husband, so it sounds like my husband. "Swallowing carbon is dumb, change its voice. While waiting for the opportunity to assassinate Zhao Xiangzi, he failed and died. . "

Historical Records Biography of Assassins: "The lacquer is strong, but the charcoal is dumb, which makes its shape unknown."