Why Aluminum Foil Has a Dull Side and a Shiny Side - Reynolds Aluminum Foil Wrap

Consider the mystery solved..
According to Reynold's Kitchen, the difference between the two sides of aluminum foil is just a result of manufacturing.

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For over 70 years, home cooks like you have trusted Reynolds Wrap Aluminum Foil’s strength, versatility and durability all throughout their home. Reynolds Wrap can be used to protect food in all steps of the cooking process, and helps keep leftovers fresh when the cooking’s done. Use Reynolds aluminum foil to line baking pans and sheets for easy clean-up, or to wrap food while roasting or baking to seal in flavor and moisture.

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