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

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People are just realising what you should use each side of tin foil for