"Examining corpses and bone fractures may reveal no visible marks. In such cases, douse the body with wine dre…
"Examining corpses and bone fractures may reveal no visible marks. In such cases, douse the body with wine dregs and vinegar, then cover the exposed area with fresh oil paper or a transparent parasol. Under direct sunlight, observe the body through the parasol, any hidden injuries will become visible. On rainy days, hold hot charcoal close to the area instead. This is a reliable method. When examining bones with a red oil-paper umbrella, any site of trauma will show a faint red path or shadow. Where a bone is broken, both ends will show a blood-hued halo. If the injured bone appears flushed and vivid in sunlight, the blow was inflicted during life. If there is no blood halo on fractured bones, the damage occurred after death."