The needle tips were made to pierce through the skin, and the process was repeated two or three times on every spot. Then they sprinkled the wounds with charcoal ashes to make the black color settle in.
將鐵針的針尖刺入皮下，每處地方反覆剌兩三次，然後將炭灰抹在傷口，讓黑色素沈澱。