Glow in the Dark Polyester Thread, 40wt, 200yds. This fun thread line is designed to glow brightly in the dark! Ahrora™ can be used on anything from art quilts to costumes to embroidery, and is a fantastic way to add another dimension to any project. Just switch off the lights to see your stitching light up! Leave it in the sun or under a bright light to recharge for a stronger glow. For machine embroidery, decorative stitching, art quilts, cosplay costumes, crafts.