Create a secret message or design using our Moon Glow Invisible Ink Pen! Each pen splits into 3 parts with Pink, Yellow and Blue ink. Completely invisible under daylight, these glow spectacularly under UV Lighting / Blacklights! Remove the UV and the ink is invisible once again. How to use: After application, allow approximately 1 minute for the ink to fully dry for the best effect. Why Moon Glow? All of our cosmetics are cosmetically certified and conform to EU1223/2009. Moon Glow products are never tested on animals.