Either side works. For standard and heavy-duty foil, Reynolds Wrap says in its product FAQ that it is perfectly fine to place food on either side, so the shiny-versus-dull argument at your house can end before Thanksgiving on November 26.
That includes the foil tent over your turkey. What actually changes the bird is how long the tent stays on and how much room you give it.
Why one side shines in the first place
The two finishes come from the factory, not from any plan for cooking. According to Reynolds, the foil is milled two layers at a time so it doesn’t tear. The sides that touch the polished steel rollers come out shiny, and the sides pressed against each other come out matte.
America’s Test Kitchen put the myth in the oven. In a test published in March 2022, two potatoes of the same weight were baked in foil at 350 degrees, one with the shiny side in and one with it out. Both reached 198 degrees after an hour. A foil-covered pan of mashed potatoes ran just 2 degrees warmer with the shiny side facing in.
How to build the tent that matters
Reynolds’ turkey guide calls for folding an extra-long sheet of foil into a tent, leaving about an inch between the top of the bird and the foil so heat can circulate, and crimping it onto the long sides of the pan. The brand roasts at 325°F with the tent on for the first hour, then removes it so the skin can brown.
The USDA’s Let’s Talk Turkey guide gives a little more time: if your roasting pan has no lid, a tent of heavy-duty foil can stay on for the first 1 to 1½ hours. The agency says that keeps the turkey moist, lets heat circulate and cuts down on oven splatter. You can also wait and add the foil once the skin reaches the color you want.
The one roll where the side counts
Side does matter if you buy nonstick foil. Reynolds says its Non-Stick foil goes dull side up, where the food sits, and offers a shortcut: if you can read the printing on the foil, it is facing the right way.
Whatever foil you use, the tent won’t tell you when dinner is ready. The USDA says a whole turkey is safe at 165°F, checked in the thigh, wing and breast, measuring the innermost part of the thigh and wing and the thickest part of the breast, and suggests letting it stand 20 minutes before carving.
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Tear your foil whichever way it unrolls, and save your attention for the thermometer.
