漆身吞炭

Explanation: Body paint: body paint for the skin disease; swallow charcoal: Charcoal that dumb throat to swallow. Intentional distortion sound change, people do not recognize myself. 　　Source: "Warring Zhao policy of a" paint, as Li and Yu Rang, poverty must go eyebrow, since the punishment to change their content. ... ... Swallow charcoal and dumb, and change its tone. "" Historical Legends of Assassins, "Paint as Li (skin disease), swallowing charcoal dumb, so that the shape unknown."