Special Effects hair dye is a semipermanent, conditioning hair color that comes in a wide spectrum of fabulous colors. The most intense long lasting semipermanent hair color on the market. Generally lasts 3 to 6 weeks on most hair types. Lasts longer on bleached or prelightened hair. The following colors glow under black light Atomic Pink , Nuclear Red ,Cherry Bomb, Hi-Octane Orange, Joyride, Cupcake Pink , Bright as F Yellow, Napalm Orange