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black tea tea leaves hand fingers dry tea tea drink beverage chinese tea green tea herbal tea loose tea oolong tea puer tea white tea yellow tea caffeine antioxidants health natural organic plant Camellia sinensis beverage drink hot drink steeping brewing infusion antioxidant polyphenol flavonoid catechin EGCG L-theanine theaflavin tannin gallic acid ellagic acid quercetin myricetin kaempferol isorhamnetin astringency bitterness sweetness