How tin foil gave way to aluminum
For generations, thin sheets of tin were used to wrap and protect food. But the material could affect the flavor: food stored against tin could pick up a bitter, metallic taste. In the early 20th century, companies began switching to aluminum foil, which could serve the same basic purpose without that flavor problem.
Foil works because a very thin sheet can be folded closely around an item, helping shield it from air, light, and moisture. Aluminum proved useful for that job, and as it replaced tin in food packaging, the everyday name did not change as quickly as the material.
A name that outlasted its material
Today, what people commonly call “tin foil” is generally aluminum foil. The old phrase is a small linguistic fossil: it preserves the name of the earlier packaging material even though aluminum took its place. The next time you wrap a sandwich in “tin foil,” the label is older than the sheet.
