The sheet is black light sensetive and a great combo with the purple laser.The sheet is coated with a permanent acrylic adhesive and backend with a 5 mil poly coated paper liner. The luminescent system used is none-radioactive & non-toxic. Tape will glow in total darkness after exposure to artificial or natural light - it is fully charged within 30 minutes. Glows brightest the first 30 minutes after activation has ceased, but will remain clearly visible in a totally dark room to the night adapted eye for up to 12 hours. This is the highest rating in this category of products. This sheet can be used for identification of critical equipment controls, exit and directional signage - especially for escape routes and stairways, light switch covers, labesl, decals, novelties, sporting goods, trims, special effects, etc.