These ultraviolet pens are ideal for marking currency or personal property, writing covert "invisible" communications, taking sensitive notes, etc. The markings remain invisible until examined under an ultraviolet light source. (Recommended for use with the Ultraviolet LED Flashlight). Available in two models - standard felt-tip pen, and the new "UV Space Pen" (utilizes pressurized UV ink cartridge and writes at any angle, even upside-down, underwater, over grease or fingerprints, under any weather conditions.)

NOTE: These pens may not work well on some white papers; recommended to use on colored paper.