Keywords: Spinochrome-B-3D-balls.png Ball-and-stick model of the spinochrome B molecule a 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 Resorcinols Dyes Images by Jynto |