DirectGlow Invisible UV Ink Marker Pen with Ultraviolet LED Keychain Blacklight

This little light and UV ink pen worked well for what I needed it for.

Cute glow in the dark markers that actually work! I enjoyed the using the little flashlight that comes with it (especially to be able to see if what we were writing showed up). I tried the marker on a paper project and fabric project—worked great on both. The size of the markers were perfect for the projects I used them on. However if you are planning a bigger project, you may want to order more than 1. Also the marker is fine tip—which was good for my project. Easy to use. Definitely recommend this product!

I used this on top of an acrylic painting and it worked pretty well. The first picture is the first day (the plant on the bottom right had been done the day before and I redid a couple of the lines, so you can see the older stuff had already faded there) and then the next is two days later. It faded a little but is still visible. I hope it won’t fade more. It could also be because it was on top of paint.The black light it comes with is very bright, which was surprising for such a small keychain light. I actually wrapped a little bit of cardboard around it so it wouldn’t hurt my eyes when I use it.

I got this for a little project and activity that I wanted to run with my students. I was very pleased with how well this worked for exactly what I needed. Very cool!

My daughter has a 80s style slimline phone that is used for a prop for show choir. We think someone took her and put their name on it. (If someone had to do that maybe they couldn’t afford it. I just considered it a donation.) So, I bought a new one and this marker. My daughters name is literally all over this using this marker but you only see it in the one non conspicuous spot that we wrote with this marker.Using the black light you can see her name everywhere but without it you don’t see it. We did write one spot on the phone so know one knows we did this but now if it gets taken we can prove it’s hers! Lol yeah I’m a bit petty but this is great.I will update once competition season comes around to let people know if it’s seen with stage lights.

It was inexpensive and you get what you pay for. The marker is pretty cheap but it did work. The light is just really weak, although it worked too. Great as a party favor, or a magic trick for your kindergarten class or to introduce a 7th grade science lesson on the spectrum of light (which is what I was doing). Not sure what else it's good for since the light is not that bright.

We purchased the UV pen to secretly code our wedding RSVP cards. We placed numbers on the back that correlated with the guest's number on the spreadsheet. The ink dries completely clear and we were unable to see the numbers until we shined the UV light on them.

A nice, inexpensive way to secretly mark a lot of various items, plus the UV light you need to read the invisible writing comes with it. If you have a need for this item, or just want it to play around with it, it IS as advertised - inexpensive and efficient - and now my little nephew is a "real" secret agent... reading cryptic messages to himself that only he can read. On a 1-10 scale, its toy value is a 10 and as a real security tool it's an 8 because you can read the writing on some smooth or shiny surfaces depending on the angle of the light, but writing on most paper or cloth is really invisible without the UV light. Last but not least, the shipping was amazingly fast, arriving before Christmas even though ordered on 12/21.