1. 
   azulene
   (from the article `chemical compound`) ...wavelengths (i.e., the spectrum contains more absorption peaks), and light of longer wavelengths (and lower energy) is absorbed. This can be ...
   Found op http://www.britannica.com/eb/a-z/a/134
   
   
2. 
   Azulene
   Azulene has a long history, dating back to the 15th century as the azure-blue chromophore obtained by steam distillation of German chamomile. The chromophore was discovered in yarrow and wormwood and named in 1863 by Septimus Piesse. Its structure was first reported by Lavoslav Ružička, followed ...
   Found op http://en.wikipedia.org/wiki/Azulene
   
   

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