1. Disappearing Invisible Stamp Pad and Pen Refill UV Ink 2. Can be written on any dry surfaces 3. Non-toxic and eco-friendly appearing Invisible Stamp Pad and Pen Refill UV Ink:1. Invisible ink, is ideal for anti-counterfeiting and privacy protection,2. This ink is only be visible under UV light,3. It can be written on any dry surfaces, such as glass, paper, wood, fabric, plastic, etc4. Can also ...