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

Is There A Right And Wrong Side Of Aluminum Foil?

Household aluminum foil matte and bright side reflectivity measurements: Application to a photobioreactor light concentrator design - ScienceDirect

Aluminum Foil: Do you cook with the shiny side in or out?

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

Have you ever wondered why aluminum foil has a glossy side and a dull , Aluminum Foil Meals

Why Aluminum Foil Has A Shiny And A Dull Side Reader's Digest

Is There A Right And Wrong Side Of Aluminum Foil?

Why Aluminum Foil Has A Shiny And A Dull Side Reader's Digest

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

People are just realising what you should use each side of tin foil for

Tamara Čuček posted on LinkedIn

Why is only 1 side of aluminum foil shiny?

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