Is the silver coil made of hair or dead?

Silver coil is a traditional Chinese pastry, which is characterized by white skin as silver and soft and elastic inner core. This kind of cake needs fermented dough. Through fermentation, the yeast in the dough will produce carbon dioxide gas, which will make the dough swell and form a unique soft taste, and the gluten in the dough will also increase, making the dough more elastic. Silver rolls are made of dough.