炉火纯青

Traditional (Taiwan): 爐火純青

lúhuǒchúnqīng ㄌㄨˊ ㄏㄨㄛˇ ㄔㄨㄣˊ ㄑㄧㄥ

    • the stove fire has turned bright green (allusion to Daoist alchemy) (idiom)

      lit.

    • (of an art, a technique etc) brought to the point of perfection

      fig.

Character by character

Sources