Why is only 1 side of aluminum foil shiny?

Is there a purpose behind the two different textures? Should we be using different sides for certain reasons?
Is there a purpose behind the two different textures? Should we be using different sides for certain reasons?
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Why is Aluminum Foil Shiny on One Side But Not the Other?

Shiny vs. Dull Foil

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

How to Line a Baking Pan with Aluminum Foil - David Lebovitz

Why Aluminum Foil Has a Dull Side and a Shiny Side - Reynolds Aluminum Foil Wrap

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

Baking Potatoes: Shiny Side Up or Down?

Reynold's Finally Settles the Debate: This Is What Each Side of Aluminum Foil Is For

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

Why does tinfoil have a shiny and dull side? - Quora