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

Reynolds Wrap Aluminum Foil, Non Stick, 150 Square Feet