Under the circumstances, Soen studied the method of producing tea for fifteen years and succeeded in making a new type of sencha which was rich in taste and green in color (to be correct, it was 'dashicha,' a type of tea used by making an infusion).
そんな中、宗円は15年の歳月をかけて製茶法を研究し、味もすぐれた緑の新しい煎茶（正確には「だし茶」である）を作り上げた。