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2 definitions found
 for Pb3O4
From The Collaborative International Dictionary of English v.0.48 :

  massicot \mas"si*cot\, n. [F. massicot; E. masticot is a
     corruption.] (Chem.)
     Lead monoxide (also called Lead protoxide), PbO, obtained
     as a yellow amorphous powder, the fused and crystalline form
     of which is called litharge; lead ocher. It is used as a
     pigment. It is also called lead oxide yellow, as opposed to
     red lead, which is lead tetroxide Pb3O4.
     [1913 Webster +PJC]
     Note: Massicot is sometimes used by painters, and also as a
           drier in the composition of ointments and plasters.
           [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  minium \min"i*um\ (?; 277), n. [L. minium, an Iberian word, the
     Romans getting all their cinnabar from Spain; cf. Basque
     armine['a].] (Chem.)
     A heavy, brilliant red pigment, consisting of an oxide of
     lead, Pb3O4, obtained by exposing lead or massicot to a
     gentle and continued heat in the air. It is used as a cement,
     as a paint, and in the manufacture of flint glass. Called
     also red lead, lead tetroxide, lead orthoplumbate,
     mineral orange, mineral red, Paris red, Saturn red,
     and less definitively, lead oxide.
     [1913 Webster]

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