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

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

Shiny vs. Dull Side of Foil: Which Should You Use?

This Aluminum Foil in Dishwasher Hack Will Leave Your Cutlery Sparkling

Is there a right side on aluminum foil

Is There A Right And Wrong Side Of Aluminum Foil?

Aluminum foil – what is the right side to cook on?

TV Chef Tom Kerridge Reveals We've Been Using Tin Foil All Wrong - Netmums

Discover the Facts: Shiny or Dull Side Up for Aluminum Foil?

Why Aluminum Foil Is Shiny on One Side

Why Aluminum Foil Is Shiny On One Side While Dull On The Other?

Why is Aluminum Foil Shiny on One Side But Not the Other?