What is the difference between the side of aluminum foil that is shiny and the side that is dull? Why are they different?

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Is it just because of the position when it was rolled or is there a specific use for each side?

In: 1366

It’s from the manufacturing process.

Basically, during the last stage of making it, they have to do two sheets stacked on top of each other otherwise it would break. The dull side is where those two sheets are touching and the shiny side is where they aren’t touching.

There is no *meaningful* difference between each side when it comes to the way people normally use it. I’m sure if you actually got super precise and technical each side is a little different but not in any way that would affect anything a normal person would be doing. Like might hear people say you should have the shiny side up for such and such, that’s all bullocks.

Read once the shiny side reflects heat.

Want to protect something from browning or burning in the oven or on the grill shiny side out

Want to keep something warm out of the oven wrap the item with the shiny side inside

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.

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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.

Liquids will bead up and roll off the shiny side more easily. Sometimes you want this, sometimes you want to prevent this.

Nope! Just bilroduct of how they’re rolled. There’s no side that’s more effective or used for something different