Praseodymium compounds Targets are compounds formed by the lanthanide metal praseodymium (Pr). Praseodymium compounds Target is used to make specialized yellow glass goggles for glass blowers and welders. Praseodymium salts are used to color glasses and enamels. Flame lighter flints use misch metal (a rare earth alloy) containing praseodymium to produce sparks by friction.