With this black light marker, you can write invisible messages that will only be revealed under a black light. You can use it to make black light posters or for a demonstration of Ultraviolet Rays in your next science class. Invisible marker ink can be removed with soap and water. Use it with our personal Mini Black Light keychain. They're great together! Recommended for children ages 6 and up.
2 Invisible Ink Markers
NOTE: You'll need a black light to decode the message