Mori uses salt and water to extract protein from silk, creating an all-natural and edible protective layer that keeps food fresh for a long time and slows down the spoilage process of fruits, vegetables, meat and seafood. The protective layer retains moisture in the food, preventing it from drying out. It also maintains air circulation so that nutrients and vitamins in food are not lost. In addition, this protective layer can inhibit the growth of bacteria, yeasts and molds and delay the deterioration of food. Therefore, this patented technology can help food producers, food processors and retailers gain more revenue, open up new markets and reduce food waste. In addition, the protective layer is made of natural ingredients, allowing food packaging companies to reduce the need for disposable plastics, waxes, fungicides and other chemicals. This sustainable protective layer is colorless, odorless and invisible. It reduces waste, improves people's health and protects the environment.