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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.

mployed by early writers on art, though commonly designating the yellow oxide of lead, or massicot. Fairholt.

sed by lapidaries. -- Lead ocher (Min.), a massive sulphur-yellow oxide of lead. Same as Massicot. -- Lead pencil, a pencil of which the marking material is graphite (black lead). -- Lead plant (Bot.), a low leguminous plant, genus Amorpha (A. canescens), found in the Northwestern United States, where its presence i…

n making flint glass, in glazing earthenware, in making red lead minium, etc. Called also massicot.

Massicot. [Obs.]

rilliant 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.