Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue

Great security uv pen and its a big pen with lots of ink works great, pay attention to tip size I believe this is 1.5 nib...nice quality and great value for ur buck I got the blue

Invisible and works great with black lights. The longer you let it dry the less visible it is. After a few days it is quite hard to see it. Unless you have a black light. The tips are easy for kids to smash. That’s the only thing I don’t like about them. price could be a little lower.

Works ok, except on bright white paper, the brighteners in the paper (or other materials) mask the glow from this blue pen, use red on bright white paper, or other media.

Drew all over my walls in my house and my girlfriend loves it. Very bright and bold lighting. The tip started to fade after I was done drawing but I put the pen down for a while and it came back with full color!

Best black light invisible marker I’ve bought shows up so clean in the black light. Easy to use dried quickly very high-quality. The one I got glows blue in black light. Very good if you want to write an invisible note, secret letter or even write in your diary/journal.

The best invisible UV markers I have found to date. Totally invisible until you put a UV light on it and then lights up like a Christmas tree. Good selection of colors… very bright when UV light introduced.

Great value for the price. Exactly what I needed and doesn’t look like it will dry out too quickly. Works great on all types of materials and is invisible as advertised! Would definitely recommend!

The pen worked great - but one brand new pen didn’t have enough ink for me to finish a very simple project before running out. I wanted to make a very basic line drawing book for my Bible class. I wasn’t coloring in the outlines, just making single figure outlines. It started running out on the third page. By page 4 I had to alter the image to a single word to make it last. I would have needed three, which would be too expensive for one object lesson. Think glowed great under black light, there was just hardly any in the pen compared to a normal marker of the same size - maybe 15%.

De qualité, répond à mes attentes

Great product wish they made it in a thin tip but even when it is a wide bullet tip you still can;t really see the ink unless you know to look for it.

Worked exactly as advertised!

A bit pricey, but is an excellent pen that is so much better than the children’s pens being sold. This is a true professional pen that will not only last longer, but will provide a high-quality UV marker.

Works under UV, but is very thin and runny for a paint pen.