1.black-brown powder 2.timely deliverly 3.purity 99%-99.999% 4.packing: ... film in sealed bags,net weight 50kg Praseodymium Oxide:a kind of black or black-brown powder. It is used as important raw material ... Oxide, Dysprosium Oxide, Holmium Oxide, Erbium Oxide, Thulium Oxide, Ytterbium Oxide, Lutetium Oxide and so on. If you need, you can contracts us. praseodymium oxide pr6o11 for polishing powder ...