I must be getting old but I find it hard to string with black strings because they are just hard to see. My son said they had an Easter egg hunt in their neighborhood last night after dark. They used black egs and bought some kind of flashlight at a dollar store that had DEDs in it instead of LEDs. With the DED (Dark Emitting Diode) the black plastic eggs just glowed in the grass. I am going to borrow his DED and string some Technibibre Black Code strings with it to see how they work. I will let you know how it turns out tomorrow. has anyone else tried this?