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There is no discernible heat retention difference between the shiny or the dull side of aluminum foil. The shiny side is shiny because of the way foil is made. During the last pass through the rolling mill, a double thickness of foil is run between the rollers. The side of each sheet that comes in contact with the polished steel rollers comes out shiny. The other side has a matte finish.

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16y ago

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