Which side of aluminum foil is commonly used

Aluminum foil generally uses a matte surface. The two sides of aluminum foil are different. One side is very shiny, and the other side is darker in color. The bright side is called a photosensitive surface, and the darker side is called a matte surface. When we use it, we need to use a matte surface to contact food, improve the heat transfer effect, and expose the photosensitive surface to the outside. If you accidentally use it backwards, the photosensitive surface may come into contact with the food, which may cause the food to adhere to the aluminum foil.