Hungry for more? Check out the new Exploratorium website about the Science of Food.
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.