Normal tin foil on the market is made of impurity aluminum.

The previous tin foil was made of real tin. However, due to its relatively low melting point and the tendency to leave a smell after wrapping food, it was gradually replaced by aluminum.

Most of the tin foil we talk about every day is actually aluminum foil, which can be used to wrap ingredients or bake in air fryers, and aluminum foil has better freshness-keeping properties.