This ink is amazing! Gift for my grandson I hope he enjoys it as much as I have.

Package arrived on time and in perfect condition! Excellent support provided. Outstanding product!

Got this so my wife and I can be clandestine with our love notes! It works great because we both EDC an Olight Arkfield Pro flash with UV. Fun for all ages!

I bought this ink to send out "mysterous" treasure hunt letters to my friends. It has been fantastic. The ink writes well and os easy to clean up if you get some on your fingers from filling. Would be a five star review if it weren't for the label on the bottle. It just doesn't fit the motif of the namesake and is a bit garish.

Really cool. Seriously Invisible.

All arrived, all is good with pen

Great product, it was fun to use and I think my wife liked it as much or more than I did.

Really gotta make sure your pens are clean to use this ink. Other than that pretty good stuff.

The ink works great! It glows beautifully under blacklight with strong color while wet, and after it dries. Once dry, it becomes a true invisible under normal lighting, which, in my experience, is difficult to find in UV ink. The ink is thin and works wonderfully with my glass pen. It washes off easily with water even after drying on the pen. That being said, it does bleed very slightly on the sketch paper I used, and if I tried to shade in a larger section, it would make the paper soft enough to start to tear under the sharp glass pen nib. As shading profusely is not my intended use for the ink, this doesn't bother me in the slightest. Overall, I am VERY excited about this ink and will likely buy more when (and if) I ever run out.

Bought this and a couple Platinum Preppy pens to convert into eye dropper style 'invisible ink' pens for a Christmas gift to go with journals my daughter designed. Worked great and the kids loved it! Glows well even using our cheap blacklight CFL bulb.

I haven't noticed anything that would indicate the quality is less than other Noodler's Ink that I have been happy with. I like it and it works well and I haven't had any problems. :)

Enjoyed this item quite a bit. It's fun to use her secret messages with my penpals or fun part

I have absolutely zero need for this ink, though it lends itself well to security applications being both bulletproof and invisible under normal light. That being said, I've found several uses for this ink, including incorporating it into artwork and puzzles. Lately I've mostly been this ink to annotate books without cluttering the margins. I can underline sections of text, overwrite, add marginalia and footnotes, and even highlight portions of illustrations for closer review and comment. Best of all, no matter how heavily I annotate a section the book remains its pristine appearance under normal circumstances. I would say that the ink lends itself best to use with a blacklight that emits well under 400nm, the more violet blacklights often make the paper fluoresce enough to make the ink harder to read. Be sure to use a UV source when filling the ink, too, it's otherwise very easy to not notice errant drops.

The ink is phenomenal, I feel like a KGB agent when I write with it. It's smooth and holds its 'color'. Thrilled with the purchase.

I was looking for an invisible ink to incorporate into a geocache (look it up if you don't know what a geocache is, it's very fun!) This is perfect! It's truly invisible unless you have a UV flashlight or black light and leaves no water mark!

The Blue Ghost Ink was exactly what I'd hope it'd be when i got it and flows great when paired with one of my TWSBI pens

Very cool, bright ink under a blacklight. Pretty much invisible under normal light.

The ink by itself is great, just note that to be able to see this ink you need a 365 UV light, a regular UV light works but it also makes the paper shine a lot, making it hard to see the ink. I try mixing a bit with my noodler's black but could not get the ink to shine under UV light (ghost was about 10% of the mix). I'm sure it's there and its traceable but not an easy task.

the Blue Ghost is fun to use but the paper must not have a lot of brighteners in it. Some papers really show off the blue ghost well and just write with a light touch and a small uv source then it will work very well. Do not press down or you can see the writing in a side view.

I love this ink! I bought it specifically to keep track of sensitive information and it did not disappoint! You can write with this on a page and have zero indication that there is any writing on the page. All is revealed with a blacklight! It may sound odd, but I actually purchased a blacklight headlamp that allows me to write seamless with this ink. Highly recommend!

This is a hugely fun ink. You can write secret messages, of course, but it's also handy to mark up something that you don't want to ruin. It's more effective on non-coated papers - the coating on say Clairfontaine paper also glows some under UV light. I'd recommend dedicating a new pen to this ink. Since it's truly a clear ink, any leftover ink in a pen's feed will color the Blue Ghost and make it visible.

I knew this stuff would glow, but I had no idea it would glow so BRIGHTLY. Love it! Have been using it on Tomoe River 52 gsm Ivory paper and it is the most perfect stuff. It sort of stains more than some other inks I have, but you can't see it without blacklight, so does that even count as a stain?

This ink works very well and seems well behaved. There is little else to say. It is visible under an LED blacklight.

This is a great invisible ink. My children love it when they find pictures and notes that only they can find with a UV light.

It wa as I expected it to be, I even purchased a portable uv light so i can use my ink on the go. It was really nice of you guys to include another bottle of ink and I appreciated the cards that came in the package. I'm totally satisfied with my purchase Thank you very much!

I got my order today!!! Came WAY faster than expected! It was wrapped to perfection (thank you very much Anita!). I filled my pen up with this and it is amazing!! Super strong glow!!!

For kids Noodler's Blue Ghost is a hit. My only problem is having to go to other sites to find a UV light.

I don't often have to resort to clandestine means; however, when I do I rely on Noodler's Blue Ghost ink. The ink flows smoothly from pen to paper and as long as I practice a light hand while writing it's almost impossible to detect short of shining a UV light on it. My only concern is whether or not it was wise of me to tell the recipient to eat the note after reading it. I don't know that the ink is safe to ingest. That's the life of a clandestine cloak-and-dagger life I guess.

This was an impulse purchase as I don't really have a need and I didn't understand the more serious security uses for the ink when I bought it. With that being said, it is a hoot to use and takes me back to my childhood. I bought a UV flashlight from Lowes for $7, although even the clerks didn't know they carried them. I then started testing the ink with a glass dip pen. It writes well, dare I say beautifully although it's a little hard to tell without putting the black light on it. I wrote a full page on a cheap Composition Book from the Dollar Store just for fun. I think the biggest use may be to keep notes in the margin of documents and to notate them with a dot or some other indicator. It truly is invisible! If you don't know it's there, I defy anyone to detect it without a UV light.

I picked up the sample recently, and threw it in my free Charlie pen from my other bottle of Noodler's. (Thanks Noodler's!) Its great! So vibrant under the UV flashlight I picked up at the hardware store (used to find bugs, and inspect motels for ****** fluids). I have no NEED for the effect, no security justification... but my kids think its awesome. It will still be fun to write hidden notes on things. The only thing to note is... Paper matters! Many writing papers are phosphorescent, so they look whiter and brighter in daylight. Unfortunately, that's terrible for florescent inks under UV lights. In my pictures, I used 2 papers. One is a bright white sheet from a stationary kit. The other is a soft white sketch pad from Walmart. The sketch pad is not fountain pen friendly, and bleeds and feathers just as bad as you would expect... But the ink is clearly more visible than on the top sheet.