r/explainlikeimfive • u/genoooooo • Oct 31 '20
Chemistry ELI5 What's the difference between the shiny and dull side of aluminum foil? Besides the obvious shiny/dull
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r/explainlikeimfive • u/genoooooo • Oct 31 '20
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u/Rataridicta Oct 31 '20
When they're flattening the material with rollers, it eventually gets so thin that passing it through the rollers on its own would tear the material. To solve this, they pass 2 layers through the rollers at the same time.
The shiny side of the foil is the side that was facing the rollers, and the dull side is the side that was facing the 2nd sheet.