Coffee the seeds of the berry of the coffee tree, are roasted in order to develop the aroma. Coffee contains a stimulating sub-stance, called caffeine, and tannin. The tannin is an injurious substance found in tea and coffee. Long steeping develops the tannin.
Tea is made from the leaves of the tea plant. Tea leaves have to be wilted, rolled and dried by artificial heat in order to develop their flavor. Green tea is made from freshly picked young leaves, which are prepared quickly. Ex.: Gunpowder, Hyson and Japan. Black tea is made from leaves left in a heap on the ground, in order to darken and develop the flavor. Ex.: Oolong, English Breakfast, Orange Pekoe.