Madeira Glow-in-the-Dark Thread - 100m SpoolHalloween glow in the dark thread adds an element of fun and safety to costumes or trick or treat bags. Just charge the thread with natural or artificial light for a few seconds and away it glows. New technology makes this thread glow in the dark, time after time, and much longer than other glow in the dark threads making it perfect for embellishing Halloween garments and decor.