The smooth and matte side of the aluminum foil is related to the rolling process of aluminum foil production. Because the aluminum foil is very thin, the single sheet is easy to be stripped during rolling,
so it is usually double-rolled (two rolls of the same thickness), the surface directly contacting the work roll of the mill will be very light, and the other side is two. The aluminum foils are in contact with each other and are matte. Which side is front side? In fact, from the hygienic point of view, the cleanliness of the two sides is the same, because the two faces are in close contact with each other after the production process is rolled up, so which side to use which side you want to use, see what you like.
