Review on 🎃 Spooky Sleek: MaleDen Invisible Upgraded Message Halloween - Unleash Your Mysterious Side! by Donnie Boss

I bought these to discreetly mark the back of my wedding invitations with the invitation number in case someone replies and forgets to put their name. I've heard horror stories about how this happens, and although a friend gave me the idea, I didn't want to use a pen or pencil that would be visible to the invitee. I tested the pens on different sheets of paper of different colors and when I used the light I could clearly see what was being written. I look forward to using them on all of our invites and knowing who replied even if they forgot to write their name.