Keywords: Sudan-IV-3D-balls.png Ball-and-stick model of the Sudan IV molecule a reddish brown azo dye used for staining non-polar substances Derived from File Sudan-III-3D-balls png and File Trans-but-2-ene-3D-balls png 2010-07-25 Jynto and Ben Mills Azo dyes Ball-and-stick models 2-naphthols Toluenes Images by Jynto |