U-v-killer zero UV blocks ultraviolet reflection and luminescence. For all fabric, camouflage, and blaze orange. One bottle will treat two sets of hunting clothes. U-v-killer zerp UV has changed how hunters think about camouflage. It has been proven that animals and Birds have sensitivity to ultraviolet light and the 438nm short-blue wavelengths that humans are blind to. U-v-killer zero UV absorbs U-V wavelengths and thereby eliminates the Blue glow caused by fabric dyes and detergents that contain U-V Brighteners.