The amount of refiners' sugar--otherwise known as molasses--is the only difference between light and dark corn syrup. Each type is interchangeable in usage, so the choice is based on taste preference.
Light corn syrup is lighter in texture and taste than dark, and it is ideal for use in fruit jams, jellies or sauces due to its mild flavor and thickening qualities. It also makes an excellent glaze for meats and baked vegetables. When it's used in recipes, it helps retain moisture and maintain freshness. Dark corn syrup adds a hardy flavor and rich color to baked goods. Both types of corn syrup are suitable as toppings for waffles, pancakes and biscuits.