Wapsi Flashabou Fly Tying - Flashabou gives off some incredible optical color illusions when charged with a blacklight, camera flash, or flashlight. One trick is to expose the flies tied with these materials to the high beams on a vehicle prior to fishing for the evening. They will accept the charge from the light and give off a bright glow lasting up to several hours, depending upon the duration of initial light exposure. Gives off some incredible optical color illusions when charged with a blacklight, camera flash, or flashlight; Perfect for low light conditions and night fishing;