炉火纯青

lit. the stove fire has turned bright green (allusion to Daoist alchemy) (idiom) / fig. (of an art, a technique etc) brought to the point of perfection

stove / furnace

variant of 爐|炉[lu2]

the fire of a stove

fire / urgent / ammunition / fiery or flaming / internal heat (Chinese medicine) / hot (popular) / classifier for military units (old) / Kangxi radical 86

pure / simple / unmixed / genuine

abbr. for 青海[Qing1 hai3], Qinghai Province

green / blue / black / youth / young (of people)