Dan Moening in Cooler, Breezy Sacramento
>are interesting that is.
I recall a Discovery Planet show that illustrated how certain spiders can build webs that "glow" the "color" that nearby flowers do; at a certain wavelength of light anyway. Only select strands of the web were made this way, and under the right light exposure by scientists you could see them as a funnel towards the center of the web, drawing the insects right on target.
None of this has anything to do with the chemical you're after, but were you looking for "carotenoids"?