ElI5: Aluminum foil one side shiny other side dull

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Why is one side shiny and other side dull? Does it have a coating or something?

Which side should be used to touch the food? And which side should be outside ?

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3 Answers

Anonymous 0 Comments

When using it to keep something hot after cooking I always use the shiny side on the inside because I assume that side reflects the heat better. I have no idea where I got that from, think I read it somewhere or learned it from someone but thats what I do.

edit: Looked it up and while it does scientiffically work like that, the difference in reflection of the heat is imperceptible and thus not really a useful practice apparently.

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