Keywords: Spinochrome-D-3D-balls.png Ball-and-stick model of the spinochrome D molecule a brownish red pigment that occurs naturally in the shells and spines of sea urchins Derived from File Hexahydroxynaphthoquinone-3D-balls png and File Lawsone-3D-balls png 2010-12-14 Jynto and Ben Mills Naphthoquinones Hydroxyquinols Dyes Images by Jynto |