Like green tea, the following kinds of tea are called unfermented tea: freshly-picked tea leaves heat treated in order to minimize oxidizing fermentation, which is caused by enzymes contained in fresh tea leaves.
緑茶のように茶葉収穫後に加熱処理を加え、茶葉自身に含まれる酵素による酸化発酵を極力抑えた物を不発酵茶と言う。