Why is the food bag white?White paper is printed on the inside of food packaging because it is not easy to break and moisture-proof.The silver reflective material is generally aluminum foil. The reason for this is to prevent the oil in the food from penetrating the surface of the packaging bag and to prevent moisture. This material is harmless to humans, but it cannot be eaten.Aluminum plating is mainly to better prevent air penetration and light exposure, which is very helpful to protect the quality of products. If it is more demanding food or medicine, pure aluminum foil will also be used. Metal aluminum foil is more expensive. .Related article recommendation: What color looks good with food bags? (What color picture is good for the snack bag?)Related knowledge development:Is the milky white bag a grocery bag?1, White plastic bags are food grade. plastic bagPlastic bags, is a bag made of commonly used plastics, such as polypropylene, polyester, nylon, etc., as the main raw material. It is an indispensable item in people’s daily life and is often used to hold other items.2, Colored plastic bags basically cannot be used to hold food. Because colored plastic bags are made of recycled plastic bags, they will be dyed when they are resynthesized, and toxic and harmful substances will be released when heated.