When baking cakes, breads or biscuits, in order to prevent the surface from being too dark, cover the food with baking Aluminum Foil, one side is matte and the other is bright, and the glossy side is facing up, so that the surface can be heated evenly and reduce cracking. Shiny side up may cause food to stick to the foil.
link:https://www.china-clingfilm.com/aluminum-foil/baking-aluminum-foil.html