Set of 3 Invisible UV Blacklight Ink Marker Blue/Red/Yellow [Office Product]

I mostly regarded these markers as for child play, but after getting them I realized that a message can be displayed in plain site, such as when you will return home, that you don't want visitors or potential burglars to see. It must certainly be uncommon for UV lights to be a tool in average home burglaries. Only those you tell about your system and who have access to a UV light are likely to read such messages. Don't though put both the flashlight in plain site, so the few smart burglars get ideas of your intent.

Got these for Christmas for our 7 year old daughter. She had great fun writing secret messages and then using the led light to make the invisible message appear. College kids got a hoot out of "body art" using these pens. We all had "invisible" mustaches that became visible only when black light shone on them. Hearts on hands, etc. this was a really fun gift for many ages.

I would probably pass for the price if I saw it in a store. I think it might be worth a buck or 2. The 3 markers are very Very small. The 3 together are about the same size as a pencil. All of mine work. The blue shows up as a whitish color under a blacklight. This will be fun for decorating, just disappointed that they are so small.

Awesome for the black light

It's nice to get three colors in one, plus you get three of those "in one" sets as well. The color separation between the hues isn't real strong though, you just get a general glow under UV. The color kind of stands out but not like I'd hoped for. Hey, for 8 bucks though I don't really care. I have plenty of UV ink now. The multi color thing was just sauce for the goose.

This is a great product for using with children. I used these invisible ink markers to write secret messages throughout the classroom that we used my blacklight flashlight to discover. The markers were generally able to write decently on a variety of surfaces and having a few different colors to spice things up adds to the creativity. Great way to hold kids' attention!

These are super fun. Just make sure to have a black light flash light with these.

Yes they are a great tool for me, I'm a armed licensed bonded security guard and I work at nightclubs. The marker pens make up lost time at the door instead of putting on bands. The people always saying, "I can't see it" then I'll turn on the black light and say Taada!