"Certain fluorospheres may only fluoresce when excited  by 'invisible"  UV 
light.  In the case of a lure that's coated with UV brightener, it may appear 
pale and ordinary looking under room  lighting, but fluoresce under a 
blacklight, which is emitting UV as part6 of its emission spectrum.  The UV 
light from the blacklight results in emission of longer wavelength light (say 
bleu or green)  fro the lure casing it to fluoresce.   UV light from solar 
radiation also causes it to fluoresce."
Dr. Rob Neumannn    Vol 40 No. 7    "In-Fisherman"
Rick 

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