Make your work come alive when the lights go off by writing your next piece using this invisible fountain pen ink. This unique pen features an intricately designed glass tip that you dip into a special ink that glows under a black light. When you want to write something no one else should see — under normal light it’s invisible, under a black light visible… New 3 oz. bottle… This invisible ink pen is new, current product directly from the manufacturer. The bottle is glass with a distinctive Noodler’s label, and an outside Noodler’s box. Ink is all U.S. made and boasts Archival, Anti-Forgery and Anti- Feathering features. The ink is specifically designed for fountain pen use.