The unprof ink video just got funnier. This stuff hangs on like BSB. It leaked a smidge on the way, and arrived before the UV light. It was still on my hands a week later, and I'm a little OCD when it comes to handwashing. Noodler's should consider a collab with Rick, b/c their inks really do RR everyone.

Fine, but not worth the cost of shipping

This ink makes me smile every time I use it. A friend of mine and I discussed invisible inks, so I surprised her by writing an entire letter to her in this ink and sent her a UV light so she could read it! Works great. I can't really address flow because I used it with a dip pen.

I bought this ink simply to feel like a child again and pretend to be a spy. This ink works great, I had no issues with it in my TWSBI Eco and it was bright under a black light. Very nice ink.

It's probably growing up in the height of the blacklight section of stores like Spencer's and covering my bedroom walls with as many uv posters as possible to live in a purple dark room through high-school, and using anything with fluorescent ink to make non-uv posters also glow in the blacklight. I have clearly never grown out of this phase, nor do I plan to. I use this ink in porous point pens like refilled papermate flair (lightest shades well flushed of original color work best) to get the best coverage so you don't have to be right up on it to see clearly. Instead of a basic blacklight or uv flashlight I prefer using a uv gel polish curing led light for fingernails. This blue ghost can also be added to lighter shades of non-uv reactive inks to get them to react under blacklight also. Loving uv reactive colors as much as I do it would be the bomb-dot-com to have a sampler collection of just the different uv reactive colors all together.

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Works great as invisible ink. Many useful purposes including writing top secret notes to kids. It is 100% invisible without a UV/blacklight.

This ink works perfectly! I used a Lamy Safari medium nib. No issues seeing the invisible Noodler's Blue Ghost ink when illuminated by a standard 13W CFL (Compact Fluorescent Light) Black light bulb. But, the paper does need to be relatively close to this size/power light source (within 4 feet is best). I also tested this ink using an iPhone flashlight layered with tape covered with blue and purple Sharpie ink to filter out most of the visible light. This did NOT work for me. BTW, make certain your pen is very, very clean before filling with Blue Ghost. Residual amounts of colored ink will spoil the invisible effect.

I use it to write out secret messages and codes for my friends to find. instead of putting it in my fountain pen I use a dip pen for it, which which it works well with. I will definitely have to buy the bottle!

I prefer to use this on a glass dip pen, but it is just so much fun!!! It helps to have a UV flashlight to see what you're writing, but again, so much fun!!!

My son loved this ink. I bought it to go in his Jinhao shark and we had fun sending messages back and forth! All you need is a pair of blacklight flashlights, which you can get for about $10 on Amazon.

I love this ink and have already found fun and creative ways to use it. An excellent inexpensive UV flashlight for you and a friend or spouse and secret notes are everywhere. Highly recommend. Used a glass pen

I used this on a mixed media project I was working on, and it was so much fun to use. This definitely will be my next bottle of Noodler's I purchase. I am a huge fan of Noodler's inks. The man knows His stuff. So brilliant!

This was so fun to use, even as a grown man. I have a notebook with yellowish paper, and the color and contrast is phenomenal! As advertised, it's lays down without a trace--it really is invisible!

Good using them wasnt too hard if you have a set up going on and its fun to use

This is exactly what I was looking for. It's absolutely gorgeous and easy to use. Really visible in UV blacklight.

This ink is pretty cool, I got a cheap UV flashlight from Amazon to go with it. My kids are having fun with it too. I'm curious if it can be combined with other Noodler's inks to give them some fluorescent properties. Might try some mixing with what I've got left.

These samples are perfect. Blue Ghost is a unique ink at Goulet. It is invisible, but glows under a blacklight/UV light. Other Noodler's inks glow... But none of the others are completely invisible. I've used it to mark my journals secretly, send secret messages to my kids, and just play around. It's not an ink I use heavily... So these samples are perfect. Just enough to fill that extra pen a few times. I'll get a whole bottle eventually... But right now samples are perfect.And Thank you to Goulet for putting one of these in my Random ink sample pack. I don't think I would have gotten it on my own... But now that I've tried it... I can't imagine not having it!

It is invisible. You can see pen marks, but that's my writing style I think. And I have to find uses for it but I play DND and invisible clues are going to be a nice touch.

Flows well, dries quick.Works best on off-white paper.

Great! Everything went well.

This ink does not disappoint. It is so fun. I use it to write secret message letters to my nieces, and they could not enjoy it more. Looks really cool too.

I got the sample just to try it out, and loved it so much that I bought the 4.5oz bottle! It's super fun to play with, of course. But I use it to write in my journal, to mark private info on my calendar, and to jot down important info like dates and passwords. It's absolutely great! Though, don't use it on very white paper, and either clean your pen really reaaaally well or use it in a completely new pen only. Any ink residue at all will tint the ink and you'll be able to see it. But hey, the 4.5oz bottle comes with a free pen.

Really fun ink. Going to send secret messages to my nieces. It really is invisible!

Yes I know adults will use it for document security blah blah blah but man invisible ink!! I sent some to my sister with the note, Lets me spies!This ink has magically transported me back to when I was eight years old. This is an invisible ink that you can see/read with the aid of a black light. You will also need a black light to write your letters. I'd also recommend the blanket fort or a tree house for added fun and security.Seriously though, this ink with the led blacklights would really make a wonderful gift to a child old enough to use a fountain pen or dip pen (then you could be pirate spies)!Did not check the water resistance and as far as shading...hmm some bits seemed more glowy than other bits. So, not sure if that could be considered shading. If you-like me-are an adult, this ink will make you giggle like you were a kid again. Go ahead and buy some and thrill your inner child!

I bought this ink just to mess around with and was really happy with the way it performed in my pen. My first thought was that it was going to be too thin and run out of the nib but that wasn't the case at all. I am using it to hide little notes throughout the journal I'm writing for my boyfriend.

I bought this ink to use for fun and I love it but I wouldn't recommend buying a bottle of it because there is not much practical uses for it since its invisible(visible with black light). For buying just a sample this is perfect and inexpensive for a great writing experience. Note: You can barley still see this ink on paper but it looks loke water.

Great for sending secret notes! We also plan to use it in our Halloween decorating, sending scary messages that appear and disapper! As noted in other reviews, make sure to have a UV light so you can read as you write!

Makes me feel like a kid again!

This ink is just too cool. Great for hidden journal notes.