Lead monoxide (also called Lead protoxide
, 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
" Massicot is sometimes used by painters, and also as a drier in the composition of ointments and plasters."