Aluminum Foil: Should the Shiny Side be Up or Down When Cooking?

Since aluminum foil has a shiny side and a dull side, many cooking resources say that when cooking foods wrapped or covered with aluminum foil, the shiny side should be down, facing the food, and the dull side up. This is because the shiny side is more reflective and so will reflect more of the radi

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Aluminum Foil: Should the Shiny Side be Up or Down When Cooking?