Fes has to watch the world's second-largest Tannery~~ (the world's first in India, the world's third in Turkey) visitors can't go to the leather dyeing house to visit, can only see workers from the roof of the surrounding stores They dip the leather process. Under the leadership of the local brother, we walked into a leather workshop. He specially grabbed a mint leaf for everyone to ease the pungent smell of "smelly egg", and then began to climb the stairs. Let us explain the process of leather production.