Why is only 1 side of aluminum foil shiny?

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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Shiny or dull side?

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Aluminum Foil: There Is Only One Shiny Side? Why Is That?