With this pen, you can write invisible messages that are visible only under ultraviolet light. The pen with invisible ink has such a light in the cap. This pen is a great gift for children as well as for your friends. No one can see what you write with this pen, but as soon as you get to a disco, everything is revealed. Some people also use this pen to write cheat notes, but you can use it for a love message too! 3 types.
