Exposure (Withering) is a procedure that causes physical changes and Chemical reactivity of the substance in the tea leaves. Exposure to tea in the tea leaves to evaporation. Make the tea leaves are withered and permeability of substances inside and outside cells in the muscular tea polyphenol oxidase enzymes. righteousness to oxidation and polymerization Catalysis polyphenol compounds Chemical reactivity make as a new element that makes the tea color. Smell and taste different.