You get to decide which side of the foil should be facing outwards and the choice is always going to be a matter of personal taste. In reality, in the long length of time it takes to bake a potato, either side will work basically the same. Reynolds is here to make life easier by offering an important clarification. For example, Robert L. Wolke in What Einstein Told His Cook and America’s Test Kitchen say that it makes no difference at all in cooking. Rather than which side is out, a bigger difference may be made by how tightly the potato is wrapped. At each successive pass through the rollers, the thickness is reduced. Both sides of the foil are equally effective. Please contact for permissions. It’s particularly designed with kids in mind. So, it is up to you which side of the aluminum foil goes up. Since aluminum foil has a shiny side and a dull side, many cooking resources say that when cooking foods wrapped or covered with aluminum foil, the shiny side should be down, facing the food, and the dull side up. Both sources provide the following, similar explanation (paraphrased): Aluminum foil has a shiny side and a dull side. So which side of the foil do we need to be using? However, their explanations make little sense. There is no difference. Have you ever thought about why the two sides have different finishes, though? For example, as the aluminum is rolled out, it heats up. However, the term tin foil is used for aluminum foil in many regions, including by some in the United States. There’s actually a reason as to why foil has a shiny side and Reynolds Kitchens is here to provide answers. The sides of the aluminum that come in contact with the steel rollers become more polished and shiny, and the sides of the aluminum that come in contact with itself become duller. Honest! All content © 2019 by Eric Troy and CulinaryLore. Shiny surfaces reflect waves more than dull surfaces. Many of the objects that we use on a regular basis have hidden features. The information on this page, then, applies to both aluminum foil and tin foil as both terms refer to the same product. Chris Winters. The foil will be heated through convection and this energy will be transferred to the potato, and as the moisture in the potato heats up, the potato is cooked through steam. https://www.womansday.com/.../a60228/right-side-of-aluminum-foil This means that the heated coils, sides, and racks in your oven are emitting infrared energy. The other 1.5 percent is made up of silicon and iron to give the packaging material its strength. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. A large block of almost pure aluminum is rolled through giant steel rollers, several times, reducing the thickness of the aluminum block and spreading it out to make it longer. Yes, the shiny side is more reflective but reflective of what? There’s actually a reason as to why foil has a shiny side and Reynolds Kitchens is here to provide answers. While some small amount of additional energy will be reflected by the shiny side, the difference is so small that it will make no practical difference in cooking. Only a little of the heat transfer in an oven is through infrared radiation, which is invisible light rays. The truth is that the shiny side of aluminum foil is only a little bit shinier than the dull side. When it comes time to solve all of the great mysteries that life keeps presenting to us, we have got you covered. The side in contact with the roller came out shiny. When it comes to nonstick foil, the dull side (nonstick side) should be the side that actually touches food. Many of the objects that we use on a regular basis have hidden features. Did you know that plastic pen caps come with holes so that you can remain safe if you happened to swallow one by accident? Should The Shiny Side Of Aluminum Foil Be Up Or Down When Cooking? There’s actually a reason as to why this is and Reynolds Kitchens is here to provide answers. We had no idea that there was a legitimate reason for this contrast in appearance. Many people believe that it matters which side is used up or down. Aluminum foil is made from 98.5 percent aluminum. It is at this point that the shiny and dull sides of the aluminum are created. The word you want is 'right,' by the way, not 'write' unless there are letters on your foil. Conduction is when heat is transferred through contact of one object with another hot object. If these layers were not brought into contact with each other during the production process, the foil would break. Although most resources still say it is true, the shiny side should be down, some newer sources say that it makes no difference which side of the aluminum foil faces up. It is due to the manufacturing process. How to Line a Baking Pan with Aluminum Foil - David Lebovitz One side becomes shiny because that is the side that is not coming into contact with any other sheets of metal. When the sheets of aluminum are rolled out, the side that comes in contact with the rollers come out shiny.. Holes so that you can place either side in contact with each other during the production process, the source... A legitimate reason for this contrast in appearance they cooked exactly the same must be again! Reached, and the large flat sheet is spooled into a thin with! Whatever side makes no difference 4-in-1 Wall-Mount Paper Towel Holder | Plastic and! 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