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

If using non-stick foil, follow the manufacturer's recommendation #lea

Which side of the foil should be in contact with the food, the matte or the gloss? - Quora

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

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

Aluminium Foil, which side up? Shiny IN or OUT? - Warren Nash

Lynette Muller - Tin Foil Fact Let's Learn (Kaalvoet

Tin foil – shiny side up or down? - Blue Sky Questions

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

Tom Kerridge shocks Fresh Start fans with tip - should tin foil be shiny side up or down?

The Reason Aluminum Foil Has Both A Shiny And Dull Side

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

The Real Reason Aluminum Foil Has a Shiny Side and a Dull Side

What You Should Know About Aluminum Foil

Why Does Aluminum Foil Have a Shiny Side and a Dull Side?