The first thing you notice when you walk in the place is the wonderful smell. That smell is a mixture of 60% corn syrup and 40% sugar, steam-cooked to 310° F, or hard-crack stage. The hot candy dribbles out of the boiler onto a metal table.
To make the rainbow-colored Round-Up, various colors are mixed into the hot candy. The rainbow colors are just the veneer of the lollipop and contain no flavoring.