白はっ金きん黒こくMeanings1nounplatinum blackTechnical term for finely divided platinum powder, black in color, used primarily as a catalyst in chemical reactions.白はっ金きん黒こくは水すい素そ化か反はん応のうの触しょく媒ばいとしてよく使つかわれる。Platinum black is often used as a catalyst for hydrogenation reactions.
