Three views of the same flasks of fluorescent rhodamine dye.  At the far right
is a picture of how the flasks look under regular room lights.  In the middle,
the scene is illuminated by a UV-emitting flashlight (otherwise known as a
blacklight).  Under this strong, high-energy illumination, the fluorescence from
          
          
       
        
      
 
         
         
         
         
         
         
         
         
        