蓝矾 lánfán chalcanthite; copper(II) sulfate pentahydrate Origin Definitions Defs Strokes Stroke Words Sentences Sents 蓝 藍 lán adjective blue blue; like the color of a clear sky矾 礬 fán alum Any of a group of hydrated double sulfate salts of certain metals, such as 明矾 míngfán, which are used in leather tanning, papermaking, and dyeing