ABSTRACT
Tea is popularly consumed worldwide, second to water, and more than coffee and carbonated soft drinks. As a most popular beverage worldwide, tea is mainly divided into three types based on the degree of fermentation during manufacturing, namely, unfermented green tea, totally fermented black tea, and partially fermented oolong tea. Green tea is consumed primarily in China, Japan, and India, whereas black tea is consumed primarily in Western countries. Oolong tea production and consumption are primarily conned to southeastern mainland China and Taiwan. White tea, yellow tea, and postfermented tea such as pu-erh tea also become popular in recent years. Each type of tea has its own processing method, which makes them different by quality characteristics, such as appearance, color, aroma, and avor.
