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Shiny side up. The reflective surface is designed that way to deflect radiation better. But, babies won't die if you do it the other way around.

AnswerTake it from the people at Reynolds. They make the stuff. They will tell you that it makes no difference which side is in or out. Optical light scatters differently from the dull side than from the shiny side, which is more like a mirror. But both sides absorb or reflect light (and infrared radiation) equally. Answer

Scientifically speaking, the shiny side is better top be towards your food when cooking--the reflective surface makes for slightly faster cooking. The dull side should be towards the food when freezing--the shiny side outwards will keep any heat that would enter at bay better.

These make very small differences, however, and your food will probably come out APPROXIMATELY the same either way.

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