To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
This ink came highly recommended as a good waterproof ink for sketching using a fountain pen. It hasn't disappointed me so far. It is quite a dark black, dries reasonably quickly and, as promised, is waterproof once dry.
Have used several black inks and never been totally happy till I tried this one. Have sold the other bottles and will be guying this from now on. Prefer brighter colours, so this will be my only black.
* Reasonably quick drying (not fast, but faster than some of my other inks). * Smooth writing. * Extremely black ink! It is made with carbon microparticles which makes it very black. * Waterproof and fadeproof (an earlier test of this ink has been sitting the sun for close to a year and hasn't visibly faded)
* When the bottle is full, the internal reservoir doesn't work very well. * This is a rather expensive ink. * As a pigment ink, you can smudge it even when it is dry. It doesn't smudge easily but it is possible. * If it dries out or comes into contact with other inks it turns into a sludge that can clog up your pens. Regular cleaning and a pen that doesn't dry too quickly is essential.
I will compare this to the other permanent ink I have (rohrer & klingner Scabiosa). Right off the bat the colour is spot on, a REALLY deep black that's even blacker than my previous Diamine Onyx Black. It's important to note that when filling a pen with this, it can mix with other residual ink in the pen and form a sludge/gel that blocks it - I cleaned mine in an ultrasonic cleaner first to ensure it was going into a fully clean pen. The ink itself flows really well and far better than many other permanent inks which can cause the pen to skip (especially if you forget to re-cap the pen when you're busy). This Carbon Ink flows beautifully well but doesn't blot (I'm using it on a Lamy Safari with a fine nib). This makes it a very smooth ink to write with. The most important thing for me was that I use this at work and it MUST be waterproof/indelible. I took some pictures to illustrate. One is with a drop of water and a drop of 96% ethanol dropped onto it to see if it diffuses at all. The second picture is after I have deliberately run my finger across to try to smudge it. As you can see it doesn't smudge at all with the alcohol (which easily soaks into the paper) and does so only very slightly with water. I've also included the same test with my existing Scabiosa (dark purple) ink and you can see that even though that is also permanent, it diffuse more when wet and also smudges more than this Carbon Ink does (I'd score the Scabiosa 3/5 but this Carbon Ink 4.5/5 here - it's simply much better in this regard). I have re-uploaded the images because Amazon displays them in a random order rather then the order I upload them so annotations make them easier to understand. Drying time appears to be quicker than Scabiosa too so that's another bonus there. It's a bit expensive but you get what you pay for and having permanent ink that really is permanent for work is invaluable to me so I don't mind the outlay.