Tin foil is made from aluminum, which is a very expensive material to produce; it takes a lot of electricity to produce from aliminum core. This makes tin foil a product that is better to avoid, especially because it often disappears in the non-recycled trash can after short use. Next time you bring a plate of food to your neighbours, cover it with the lid of a pan, or with another plate. You will find that this actually forms a better cover.