The "inside" of tin foil is the dull side. The "outside" of tin foil is the shiny side.
When baking cookies, it is recommended to use the shiny side of aluminum foil to help reflect heat and promote even baking.
If you are baking something wrapped in foil, you should probably have the dull side of the foil out. The dull side reflects heat a bit less than the shiny side. This means that cooking with the shiny side out would make your food cook more slowly.
An alternative to using tinfoil when baking is cooking parchment or a glass cover (make sure it is oven safe). The tin foil is solely there to block some of the heat from escaping.
The white card side of an aluminum foil tray lid should be placed on the inside. This orientation helps reflect heat back into the food, improving cooking and heating efficiency. Additionally, it prevents any potential contamination from the cardboard side coming into contact with the food.
The shiny side of aluminum foil is the correct side to use for cooking.
Aluminum foil is shiny on one side because of the manufacturing process. During manufacturing, the foil is rolled to make it thinner, which creates a shiny side. The dull side is created by the contact between the foil and the rolling machinery.
The shiny side of aluminum foil reflects heat better than the dull side.
When cooking with foil, use the shiny side facing out to reflect heat and the dull side facing in to absorb heat.
the right side
The shiny side of aluminum foil should be facing outwards for better heat reflection.
You should use tin foil with the shiny side facing inwards towards the food and the dull side facing outwards when cooking with fire. This can help reflect heat away from the food and prevent the foil from burning.
The shiny side of cushion foil sheets typically faces outward. This side helps to reflect heat and keep items insulated or protected.