Q: Why is aluminum foil shiny on one side and dull on the other
Q: Why is aluminum foil shiny on one side and dull on the other side?
A: Aluminum foil is made by flattening blocks of aluminum into thin sheets and then passing these sheets between two highly polished steel rollers, two sheets at a time. The side of the sheets that come into direct contact with the steel rollers emerge with a high shine; the two inner sides emerge with a dull finish. Therefore, the difference in the two sides of aluminum foil is just a result of the manufacturing process and has nothing to do with which side should be placed next to the food.
– ‘Ever Wonder’ by Douglas B. Smith