The outer layer of hairtail is white and edible. The silvery white thing on hairtail is actually a layer of skin formed by special fat, which is called "silver grease". It is a kind of high-quality fat with high nutritional value and no fishy smell. You can eat without shaving. When washing hairtail, you must try to keep this layer of silver grease. Don't scratch the silver scales deliberately, and don't soak hairtail with hot water above 75 degrees, because silver grease will melt when it meets hot water at 75 degrees, which will cause a waste of valuable nutrition.