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

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

People have just learnt they've been using tin foil wrong their entire lives - and their minds are blown

Aluminum Foil: Is There A Right Or Wrong Side?

The difference between the shiny and the dull side of aluminium foil

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

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

there's a correct way to use tinfoil apparently #inmy30s #cookingtipsa

Mistakes You Should Avoid Making With Aluminum Foil

One side of aluminum foil is shiner than the other. Here's why and when to use it

Aluminum Foil: Should the Shiny Side be Up or Down When Cooking?

What's wrong with the aluminum foil in Vietnam? I have lived here 12 years and always wondered why some brands of foil always come out like this And if it's safe to

This Is Why Aluminum Foil Is Shiny On One Side And Dull On The Other - I'm A Useless Info Junkie

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