Invisible Ink Pen, Spy Pen with 9 PCS Mini UV LED Keychain Flashlight, Disappearing Ink Magic Pens with Black Light Markers for Secret Notes, Fit for Christmas Halloween Holiday Gifts (9 PCS)

This is so cool! We used for a DIY escape room and it worked great! The kids loved it

These worked well for notes from Santa on Christmas morning. Kids love the magic of invisible ink.

These are very fun for the price. I got them for a treasure hunt puzzle game with a group of children. The lights aren't very bright, but I was pleased that I got several for the price (and I already have a UV flashlight so it wasn't a huge loss that they aren't the best). The markers were all full of ink--none were dry. They show up nicely under the lights, especially the pink. My biggest complaint is the blue appears to be pretty much identical to the yellow? At first I thought maybe there was a mistake and the blue marker got filled with yellow ink when they were made, but the blue pen is also the most visible pen under natural lighting, so it seems to be different. All of them are a bit visible until they dry, but if you look closely you can still sort of see the blue marks hours later. I may have gotten a bad one. The other pens are great though! I definitely recommend these (especially if others are getting better blue markers), they're lots of fun.

The ink shows up great under the flashlight (image doesn't do it justice) and dries quickly so you don't have to worry about smudging. A huge hit with all my nieces & nephews (ages 3-10).

Got it for my 6 year old as a gift and he loves it. It’s fun to use. It writes like your typical marker. It’s good quality and very durable. They seem to dry pretty quickly too.