Some Natural Organic Pigments OH o CH3 O H CO2H HO OH OH O Kermesic Acid (Carminic Acid Z=H from the insect coccus cacti Indigo from Isatis tinctoria (woad) Z=Br Punicin or Tyrian Purple from mollusks of the genus Murex Crocetin CH3 CH3 from saffron B-carotene from carrots extensively conjugated pi-electrons“extensively conjugated pi-electrons