Why does aluminium foil have a shiny and a dull side?

The Reason Aluminum Foil Has Both A Shiny And Dull Side

Why is only 1 side of aluminum foil shiny?

Why Aluminum Foil Has A Shiny And A Dull Side Reader's Digest

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Why does aluminium foil have a shiny and a dull side?

Shiny or Dull: What Side of Aluminum Foil's Right?

Why Aluminum Foil Has a Shiny and a Dull Side

Aluminum Foil: Is There A Right Or Wrong Side?

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Aluminum Foil: Do you cook with the shiny side in or out?

Why is Aluminum Foil Shiny on One Side?, by Harlan Brothers