DirectGlow General Purpose Invisible Blue Blacklight Reactive Ink with UV Marker Pen and Keychain Blacklight for Glow Party Secret Message Escape Room Goodies Bag (2 Ounce Bottle Kit)

Bought this for an invisible ink art project. The tiny black light is hard and to use and bad quality so don’t rely on that. Other than that the ink seems good. Haven’t tested longevity yet

Works great! I love the pen. disappears very well and only shows up via backlight. I'm going to make some really cool art with this

funciona bien para marcar y supervisar las tareas de limpieza posteriormente

Purchased for 8 year old black light trampoline birthday party and it worked amazing. Completely invisible during normal lighting. Pen works great on skin and stayed on for a while, understandably the sweating did cause it to fade. Ink bottle was used for hair tips that stayed throughout the party.

This pen and ink are wonderful. I use this to mark items for my business and it works great. No one knows the items are marked except me. Amazing!

I needed some invisible ink to write secret messages for a "Escape Room" that some coworkers et up for an office party. DirectGlow General Purpose Invisible Blue Blacklight Reactive Ink did a fantastic job, and the included blacklight pen really made the event fun.