**”There is no meaningful difference between each side when it comes to the way people normally use it.”**
Wrap the potatoes in dull side out and the onions in the shiny side out before you put them on the BBQ or in the fire. You can tell them apart and potatoes need to cook longer or hotter. Plus, if someone asks for an onion, you can pick it out from the potatoes.
Shiny side up looks nicer. The superstitious will place shiny side in, to bounce the heat around. Complete hogwash. As are Columbia’s foil ‘dots’ lined long underwear, which makes them colder than regular long underwear… because it’s METAL, against your SKIN. People get funny about the properties of aluminum foil.
From the Reynolds Brands page on aluminum foil:
**What side of the foil should I use, shiny or dull?**
With standard and heavy duty foil, it’s perfectly fine to place your food on either side so you can decide if you prefer to have the shiny or dull side facing out. For Reynolds Wrap® Non-Stick Aluminum Foil, you’ll want to have the dull side facing up. A tip is that if you can read the writing on the foil then you have the right side up to get all of the benefits of non-stick foil.
Essentially both sides are the same. The shiny/dull difference is a side effect of the manufacturing process for regular aluminum foil, there’s no technical difference.
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