Bests & Worsts Reviews from Amazon

The first thing I did was write on my hand with it to get the ink started in my pen, and I can say for certain that it really is permanent. It won't wash off. It is also fully invisible even on bright white paper as long as the pen is thoroughly cleaned before use. I bought this ink for drawing hidden details in my artwork, to surprise my more observant fans, but since most people will likely be using it for writing, I will include photos of what it looks like when ordinary written words glow under the blacklight. I put it in a Noodler's standard Nib Creaper flex pen and applied it with a very light touch, avoiding the flex feature to see how well it worked for fine lines. It is powerful stuff! The photos I took don't do it justice, because in real life, it looks like I am writing with liquid light. The blacklight kept showing up as brighter than it was in my photos, which decreased the appearance of contrast. In person, it looks like it is illuminated from within, even in indirect lighting. This has a huge variety of possible applications. I could see using it for invisible identification markings to verify the authenticity of a product, home decorating (This would be really fun for drawing constellations on the ceiling!), making editing marks on documents, getting kids interested in penmanship, or writing secret love letters for your spouse. As an added bonus, it works a lot more smoothly in my pens than any ink I have ever used before. This is a high quality product, deserving of its positive reputation.