Before revision: A roll of aluminium foil|alt=Refer to caption A foil is a very thin sheet of metal, typically made by hammering or rolling.Britannica, The Editors of Encyclopaedia .
After revision: A roll of aluminium foil|alt=Refer to caption A foil is a very thin sheet of metal, typically made by hammering or rolling.Britannica, The Editors of Encyclopædia .