Keep secrets between your best of friends with the SmartLab Girls Only! Purple Secret Message Lab with invisible ink and erasable markers! This set comes with 2 cases that are full of goodies that will get all the best friends together to make sure their secrets are told in the best way possible.
No one will be able to read what they put because it is a secret in the set itself to know how to reveal the invisible marker! This crafty set helps kids learn STEM with a focus on the sciences of what makes the markers invisible. It is a simple thing that is easily overlook, literally, and would not be found out if it wasn't for the 24 page booklet full of illustrations that explain how this phenomenon works and why it is so much fun!
