No significant difference: while the bright side reflects heat more and the dull side absorbs it, the difference is so small that it does not significantly affect cooking.
Practical considerations: The main difference is the manufacturing process. The bright side is the result of the final passage through the rollers in the factory, while the mast side is the result of the presence of the sheet inside during the manufacturing process.
What should you do?
This is not critical: for most cooking shoots such as wrapping food or clamping mussels, you can use one or the other side without any appreciable impact on the outcome.
When using to roast or bake: If you try to think about the heat away from food (for example, if you cook something delicate), you can use the shiny side outwards. Conversely, if you want to keep more heat and crispy foods (e.g. when cooking vegetables), the blusher side can be placed in front of foods.
Conclusion:
Although there are slight differences, in most cases it is acceptable to use either side for cooking. Choose the bright or dull side according to your preferences, but rest assured that it will not dramatically affect your meal.
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