Lead(II,IV) oxide, also called red lead or minium or Lead tetroxide , is the inorganic compound with the formula Pb₃O₄. A bright red or orange solid, it is used as pigment, in the manufacture of batteries, and rustproof primer paints. It is an example of a mixed valence compound

${\mathrm{Pb}}_3{\mathrm{O}}_4$ consists of PbO and PbO₂

Oxidation state of Pb in PbO is +2

and in PbO₂ is +4

When heated to 500 °C, it decomposes to lead(II) oxide and oxygen. At 580 °C, the reaction is complete

$2{\mathrm{Pb}}_3{\mathrm{O}}_4\to 6\mathrm{PbO}+{\mathrm{O}}_2$