Why does aluminum foil have one shiny side and one with a matte finish?

3 months ago

Thomas Edison invented a phonograph machine in the 19th century using tin foil.
By the 20th century, tinfoil was replaced by aluminum foil, though many still call it 'tinfoil'.
Aluminum foil is made by rolling pure aluminum between steel rollers, resulting in a shiny and a matte side.
The shiny and dull sides of aluminum foil are due to the manufacturing process, but it doesn't matter which side faces the food.
A fun fact: Aluminum is the most abundant metal in the Earth's crust.
In 2005, MIT researchers studied whether aluminum foil helmets protect against radio signals.

Hasty Briefsbeta