Side does matter
Several of you have mentioned the different sides of Reynolds wrap and its' impact on food. For years we have conducted a test in the lab where similar potatos are baked unwrapped, wrapped shiny side out, and shiny side in.
As would be expected, the potato baked with shiny side in cooks faster. The dull aluminum side absorbs radiant heat and the shiny side reflects the heat. The potatos come out crisper and stay warm longer cooked this way.
A few Reynolds wrap commercials have been filmed in the lab. It is amazing how with minimal props they can trsnsform the lab into an almost unrecognizable kitchen.