Cut it, tie it, hang it... With this wild and wacky stuff, your imagination (and the sky) is the limit. Make any work of art, and make it glow! After exposure to sunlight, houselight or black (ultraviolet) light, it will be able to glow in the dark for 30 minutes to 1 hour. The string is light green in visible light and glows green in the dark. Comes as a 20 foot roll blister packed in a peggable card.