Keywords: Anthrapurpurin-3D-balls.png Ball-and-stick model of the anthrapurpurin molecule also known as 1 2 7-trihdroxyanthraquinone a purple dye used in histology for the detection of calcium Derived from File Alizarin-3D-balls png and File Pyrocatechol-3D-balls png 2010-09-02 Jynto and Ben Mills Anthraquinone dyes Hydroxyanthraquinones Images by Jynto Ball-and-stick models Catechols |