Most of the time it makes zero difference.
Reynolds Wrap does have a specific product seperate from their normal foil and heavy duty foil. It is labeled “nonstick foil” and had a nonstick silicone coating applied to one side making it look dull.
So unless you paid extra for the nonstick coating, it won’t make a difference. If you did pay extra for the non stick coating, you use the dull coated side.
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