Shurtape P-661 Glow in the Dark Gaffers Tape is a premium gaffer tape product that glows in the dark. It boasts the same high quality adhesive as Shurtape P-665 and offers the same clean removability and its cloth substrate is hand tearable in both directions for ease of use and readily conforms to complex 3D surfaces unlike traditional film glow-in-the-dark tapes. The tape is photoluminescent after being activated by an artificial or natural light source. Applications for stage safety are numerous; such as marking stair and exits. Shurtape P 661 is also 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). Its premium photo luminescent pigment does provides increased glow intensity and extended glow duration though. P-661 meets ASTM E 2072 qualifying its use for safety markings in windowless areas. It is also writable / printable and its non-smearing surface provides quick temporary labels and signs that are readable in the dark.