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When you cook with tin foil do you use the shiny side up or the shiny side down?

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The shiny side should go on the inside. Here's why:

The shiny side is shiny because it is more reflective of light. While light reflectivity doesn't necessarily tell you how well something can reflect things like gamma rays, light and heat are relatively close on the electro-magnetic spectrum, so you can generally assume that heat and light will be reflected in the same way by a certain material.

In the case of cooking foil, if you put the less-reflective side outward, it will absorb more heat than the shiny side would have. Additionally, the shiny side will help heat build up under the foil.

A similar example can be found in the reflective silver safety blankets found in first aid kits. While both sides are reflective, the warming property comes from body heat reflecting inside the blanket. The outside shininess might help with visibility in emergencies, but doesn't help you get warmer.

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First answer by Venturifx. Last edit by Joyleaf. Contributor trust: 0 [recommend contributor]. Question popularity: 6 [recommend question]

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