The popular fruit-flavored Skittles candy is made with a shell of hard sugar emblazoned with the letter "S." Inside, the candy combines real fruit juices, natural and artificial flavors, citric acid, sugar and Gelatin hydrogenated vegetable oil. The production process (which, like many popular edibles, is not publicly released) takes about eight hours. The center of the candy is created first, and then the shell is applied; this process is called "panning." The shells are mixed and then smoothed and glossed. The application of the "S" logo is the final procedure. Skittles' origin was based on the M&Ms candy, replacing the M&Ms' chocolate center with that of fruit flavoring.