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Manufacturers explain that both sides of the paper have the same function. However, if we are going to use it in the best way and it is going to be used in the oven, we must take into account that the shiny side of the paper absorbs more heat because it reflects more light.
Therefore, it is recommended to keep the shiny side inside and the matte side outside when cooking. Thus, when it comes to food packaging, the application is not clear, although the tendency is to leave the part that shines the most on the outside, a practice that may respond more to an aesthetic question than anything else.
But both parts do the same job of cooking, freezing and preserving food. There is no functional difference.
Aluminum foil in the freezer: what is it for?
However, aluminum foil seems to have another unexpected function, especially if it is placed in the refrigerator or freezer.
Defrosting a freezer is one of the most demanding tasks a freezer must perform in order to better preserve food.