Does it matter which side of aluminum foil you use?
Online Answer
It makes no difference which side of the foil you use unless you're using Reynolds Wrap Non-Stick Aluminum Foil. Non-Stick foil actually has a protective coating on one side, so the company recommends only placing food on the side marked "non-stick" for maximum efficiency.
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According to Reynold's Kitchen, the difference in appearance between the two sides of aluminum foil is simply a result of manufacturing and serves no real purpose. Meaning, whether you are cooking your food with the shiny side up or the dull side up, you're doing it right.
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Aluminum foil can also be used to cover doorknobs and hardware. Wrap a bit of foil around the knobs to protect them from stray paint drips, and save your painter's tape for baseboards and door frames, where those straight blue edges are far more critical..
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Aluminum foil is actually made of two layers: one of aluminum, another that is coating. The surface of the aluminum layer that is in contact with atmosphere oxidizes and turns into aluminum oxide — hence the matte side. In that case, we should use the shiny side, since aluminum oxide is not that healthy.
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There are many options instead of using aluminum foil. Use a metal lid, silicone lid, or baking sheet to cover your foods. The benefit of these items is that you can reuse them for a long time and for other uses around the kitchen..
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The difference in appearance between dull and shiny is due to the foil manufacturing process, he said. "In the final rolling step, two layers of foil are passed through the rolling mill at the same time. The side coming in contact with the mill's highly polished steel rollers becomes shiny.
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