In the late 19th and 20th centuries tinfoil was in common usage. It gave a slight tin taste to the food wrapped in it.
After World War 2 it was replaced by aluminum foil which is cheaper and more durable without any taste. Some people STILL REFER TO IT AS TINFOIL (me among them) and so in many regions everyone living there in calls it "tinfoil". You are more precise correct? Aluminum it is and aluminum it will always be and with respect to foil tin will never again cross your lips. After all right is right and to be precise is righter than not to be. Agree?