Nowadays, many cakes are baked in tin boxes, and tin foil is very common, whether it is barbecue, oven, floral decoration or food packaging. Tin foil is a kind of film-like metal paper coated or pasted with silver, mostly silvery white. The metal composition is actually aluminum, not tin. Aluminum foil paper, also called tin foil in Hong Kong, is a thin sheet with a thickness of less than 0.2 mm, and most aluminum foil papers have bright and matt surfaces. Mainly used for packaging food, medicine, cosmetics and other chemical products.