Invisible Ink Thinking Putty
Crazy Aaron's Putty
Often used to encode top-secret information, invisible ink has a long and interesting history dating back to 4th century BC. There are all kinds of ways to make and read invisible ink (like heat and lemon juice), but our Invisible Ink Thinking Putty® uses ultraviolet light to mimic blue ink on a sheet of green paper. Write with the Glow Charger® and watch with wonder as your words evaporate into thin air.
- Recommended for ages 8+
- Color: Black with Multi-Colored Glitter | Glow: Red/Blue/Green Cosmic Glow™ | Includes Glow Charger®
- WARNING: CHOKING HAZARD - Small parts. Not for children under 3 years.