Duck Brand Glow-In-The-Dark Gaffers Duck Tape is a premium gaffer tape product that glows in the dark. It offers clean removability and it's cloth substrate is hand tearable in both directions for ease of use and readily conforms to complex surfaces unlike traditional film glow-in-the-dark tapes. Gives the added benefit of being photoluminescent after the tape is activated by an artificial or natural light source. Applications for stage safety are numerous; such as marking stair and exits. Duck Glow in the Dark Tape is printable and can be die cut to different shapes and sizes. In its uncharged state the tape has a natural color and when glowing the tape has a luminescent lime green color. The tape is typically fully charged within 30 minutes after exposure to either artificial or natural light and glows brightest the first 15 to 30 minutes after activation has ceased, but will remain clearly visible in a totally dark room to the night-adjusted eye for hours (to the night-adjusted eye it is visible, but it would not compare it brightness to say a standard flashlight). It is also writable / printable and its non-smearing surface provides quick temporary labels and signs that are readable in the dark. Please note the narrower 3/4" inch wide rolls are very small which is great for craft projects . They come on a 1 inch diameter core instead of the standard 3 inch diameter core; also the outside diameter (measuring across the roll) is closer to 1-3/4 inches while the standard 2 inch x 10 foot glow roll would measure about 4 inches across.