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Praseodymium (III,IV) oxide is the inorganic compound with the formula Pr6O11 that is insoluble in water.
PO 105 (OTTO) Praseodymium(III,IV) oxide nanopowder, APS 15-30 nm, 99.9% - used in conjunction with other additives such as silica or zircon to produce pigments for use in ceramics and glass.