Have you ever looked at aluminum foil and wondered why one side is shiny and one side is not?
Have you looked at it and asked yourself if you should put the shiny side up or down?
The variation is due to how aluminium foil is manufactured. The side that has contact with the rollers is shiny. The side that does not have contact with the rollers is dull. So, it does not matter. They are both essentially the same.
Now I am curious, am I the only one that has looked at aluminium foil and wondered if there is a right or wrong side?