이 결과로부터, 진공튜브로를 이용하여 800°C, Ar 분위기에서 열처리 실험을 실시하여 첨가 원소인 산화칼슘을 추출한다.
From this result, an additional element, calcium oxide, was extracted by performing a heat treatment experiment in an Ar atmosphere at 800°C using a vacuum tube furnace.