Invisible Ink Pen, Spy Pen with 3 PCS Mini UV LED Keychain Flashlight, Disappearing Ink Magic Pens with Black Light Markers for Secret Notes, Fit for Christmas Halloween Holiday Gifts (3 PCS)

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

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

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.

Love using these for hiding clues for escape rooms works great thank you

What a great addition to the spy gear we gathered to gift our grandsons for Christmas! We purchased lanyards to put the UV flashlight on so they wouldn't lose them. Added a "special agent" tag with their names on it to look official. They loved writing notes to each other knowing that only those with the "special" light could read them!

5 for fun, 2 for quality. Fit-for-purpose: I wanted to encourage my grandson to write letters. He doesn't have email (yet) and letters are just FUN. Writing "secret messages" in invisible ink is fun. This will do, for starters. Quality: blue and yellow look alike. The yellow must be drying out or simply doesn't flow as much as the blue (flows almost too much - looks like ink from a thicker point but isn't). Pink is pink, and lines are fine, like yellow - sometimes a little harder to see. The little keychain lights work well and appear to have replaceable batteries, though I suspect the originals will last longer than the ink in these pens. I've ordered another brand to compare, as these are "almost, but not QUITE" what I'd hoped to stuff stockings with. That said, they'll do. I plan to keep them.