Do you know why aluminium foil has two different sides?

When it comes to cooking with foil, many people wonder which side, shiny or dull, should be pointing upwards. The truth is that this doesn’t make much difference in terms of cooking performance. However, there are some subtle distinctions:

Bright side vs. side
Dazzle, The bright side of the foil reflects heat, which means that it is less likely to absorb heat and more likely to think about it.
Dull side: The dull side absorbs heat more efficiently.
What does this mean for cooking?

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