Glenn Ashmore wrote:
Check this out. http://www.nzitrap.com/Nzi_trap/Fabrics/Blues.htm

It seems that the Phthalogen Blue that is used to dye Sunbrella Pacific
Blue, and of which 90% of the Biminis in the world are made, is the 1
nanometer off from the optimum wave length for attracting biting insects.
Entomologists even use it to build insect traps.

Thank goodness I just finished sewing my Bimini and dodger in Terracotta.



That's for "Pacific Blue", how about "Royal Blue", probably more common.

Cheers
Marty