About 150 years ago, for the first time, manufacturers used tin cans to pack food. Since then, people continue to improve the form of this package, thus developing a convenient way to seal cans.
Tin cans packaging essential in people's lives, tin is rich at room temperature. Especially at 100 ℃, it's very good malleability, can be made into a very thin tin foil. Normally, people use tin foil to pack cigarettes and candies to prevent dampness (In recent years, China has gradually replaced aluminum foil with foil.) Aluminum foil and tin foil are easy to distinguish - tin foil is much brighter than aluminum foil.