[["Black Kryptonite is a variety of Kryptonite, made by heating Green Kryptonite to extreme temperatures. It can split Kryptonians into two separate beings, made up of that person's good side and his or her evil side.", 135.0], ["Black Kryptonite can split Kryptonians into two separate beings, made up of that person's good side and his or her evil side.", 61.0]]
what does black kryptonite do to superman
literature,superman