Black Tea is the fermented tea. The tea leaves are picked, withered and then rolled. The process of rolling brings aromatic oils to the surface and encourages oxidization. The rolled leaves are usually left for around two hours. Finally the leaves are fired in an oven with temperatures reaching up to 200° F. Once 80% dry, the leaves complete their drying over wood fires. The resulting product is brownish (sometimes black) in color and is sorted accordingly to size – the larger grade is "leaf grade" and smaller "broken grade" is usually used for tea bags.