Opticz Blacklight Reactive Invisible Blue Ink Industrial UV Marker with UV Light

It didn't work or come on at all

Gotta be careful that you don't over apply it as it can run, but I used this to hide coordinates to a geocache and it works and can be seen even in the day. I drew and wrote no problem.

Instructions are on the pen. Shake it, then push in the head so the ink is loaded, THEN it will work. A lot of reviews are written that it doesn't work, but it does when instructions are followed.

Took my new KTC Duke in to have it's factory mandatory dealer service. I KNEW they would do what most dealers do at the initial service, and wanted to be prepared for it. Normal 'factory/dealer' required service is commonly called a 'wall' service. Means they push the bike in, lean it next to a wall. It'll sit there, for the factory recommended length of time a service should take. Then you get a call to come pick it up, and then they bend you over the same wall and screw you for work not done. 5 motorcycles, 5 dealers, 5 different excuses on why the work wasn't done, but I caught them every time. Past history as a aircraft mechanic and copious use of witness marks and methods make this pretty easy for me. Easily and readily available UV ink makes it easy for everyone these days.This marker makes that near impossible to fake. Little dot on the bolts you KNOW (cause you researched the work required, right?) need pulled out. Like the oil filter bolts, the oil plugs, the screws to hold the air filter in, things that needed pulled apart to check the required inspection items. Place a little dot at the edge of the bolt head and the plastic/steel/aluminum and check it with the light.Once you pick the bike up from the stealer (and use the little light to prove to yourself the work wasn't accomplished), now with the manager in tow, use the little light to verify the bolts are still in the same position they were when you dropped it off. More than one bolt is near impossible to put back in the same place and have the dots line up perfectly. A small line from the bolt head across the plastics...minimal chance since quite a few have floating washers on them.After they step and fetch making excuses on why how they managed to put 20+ bolts back in the exact same positions as before the service, you can get your service taken care of by a simple call to the corporate office of the franchise they represent....and you know the best service and the only trustworthy one is the one you do yourself.Grab one for you, your friend who always has a sob story about a dealer ripping him off. You can thank me later.

Not very fine tipped, more a paint marker. Very messy. Still, does the job. The light is a little underwhelming with how heavy duty the marker is.

The UV light that came with this pen does not work. Either the light is defective OR all the batteries are dead. Unless one has a UV light on hand to light up this ink the entire product purchase is useless.

Works great for marking when selling unique items online to protect yourself from fraudulent returns.

Will definitely be getting more. Most invisible inks leave a partially readable film on the paper which allows for messages to be read without the required light, but this one most definitely is invisible until hit with the special light 😀 make passing whispered/secret information to my players very fun.