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

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

826: Aluminum Foil - The Shiny vs Dull Side — JC

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

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

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

So THAT's Why Foil Has A Shiny And A Dull Side

Why Aluminum Foil Has a Shiny and a Dull Side

The Great Aluminum Foil Debate: Shiny Side Up or Down?

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

Is There A Right And Wrong Side Of Aluminum Foil?

Aluminum Foil: Is There A Right Or Wrong Side?

Is There A Right And Wrong Side Of Aluminum Foil?

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