**Feature** Invisible Fountain Pen Ink visible under a black light Made in USA 3 oz Glass Bottle NEW! Noodler?�s Permanent Blue Ghost Invisible Ink. Safe for use in all Fountain Pens... 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 ink 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.