Oh goodness, you just reminded me of the engineering building I'd walk by almost every day to class. It was the kind of place where you would film horror movies. Old, creepy, damp, concrete monster of a building.
There's a very subtle difference in color between root beer and cola. You can tell because one is lighter than the other. Of course you have to have one of each to tell the difference but, you know, details. *dismissive hand wave*