Oolong is neither a black tea nor a green tea; it falls into its own category of tea. Yet an oolong tea may end up with more black tea characteristics or more green tea characteristics, depending on the direction the tea master takes the processing. Its flavor can range from light to full bodied, floral to grassy, and sweet to toasty. The color of the leaves and the hue of the brewed tea can also vary from green to golden to brown. The caffeine content in an oolong tea generally falls somewhere between a black tea and a green tea.