Blue is always my go to ink but too many of them are too vibrant for my liking. I want the ink to be blue but dark. This ink is exactly that. I prefer this one much more than other options in this color family. It looks like, works on all paper I have and feathers little with no bleed. Highly recommend.

What a great color! I just bought it for my new twsbi vac pen. I love them both

No, I'm not talking about Will Smith. This INK is gorgeously black. I use it in an old Mabie Todd and the flow is nice. I might need this in other colors!

Though I use many inks this is my go to. Its dark blue but just a bit off. A very subtle tinge of green. (It's not ball point pen blue! sorry Salix) Could be considered blue/black. Flows well in every pen I put it in. Cleans easily. Takes a few seconds to dry. Have not tried it on paper unfriendly to fountain pens. I've no clue on its water resistance. Would like a permanent variant. I like the color! Now if I could learn to like broad sized nibs my Jedi training would be complete [insert appropriate copyrights here]

I LOVE this color ink!

Teal-blue, with some green that comes through occasionally. Works well, not too wet on my Pilot Custom 823.

Very dark teal with a grey-ish, black-ish cast to it. Not so green. nor so blue. Similar to Diamine's Earl Grey and Graphite. After using it for a couple of weeks, I really like it. Currently in a FC 45 XLV with 1.1mm stub nib, which is a great match-up. Will definitely be a regular ink for me.

If you think of the blue side of teal. At least that's how it looks to me. A peacock blue shading to black, or a very late twilight color. Extra nice in a vintage black pen.

I hate teal. But this color is a wonderfully rich one, a touch on the blue side. Good flow and subtle shading.

The swab on this ink is very misleading. It is far more green than it is blue, the ink is very similar to Private Reserve Ebony Blue in that respect. I even did a swab of it myself and it looks nothing like the picture. I am quite disappointed because I wanted a dark blue ink like the picture.

It's very similar to Quink blue-black, but a bit bolder. Very smooth ink. It's a nice blue-black with just enough hint of green to give it some interest.

I received this ink in a previous ink drop and I didn't try it out until a month or so later and I'm kicking myself for not giving this deceptive little ink a try earlier! What I thought would be just another version of a grey-black turned out to be my most favorite ink of my entire collection! It's a greenish black that dries to sort of a teal - black. The color is intriguing and changes as you look a it. I love the color. I'm a colot persons and can't bring myself to buy a black ink. But the real clincher for me was the writing experience. This baby writes like butter! I have it in my regular ol' Noodler's Ahab and mine can be picky about ink at times. With the Verdigris in it, my Ahab has become my fav Pen! SO smooth and so thick and creamy... This combo makes me want to write the all day. Dang you monthly Ink Drop subscription! Another dent to my wallet! I must have this ink!

While the name suggests grey green, this is more of a very dark navy blue, with a slight green undertone, but you have to be looking for it to spot it. For all intents and purposes, this is a blue-black ink. A very grown up blue-black, with no teal or grey tones to it. It reminds me of the old vintage Sheaffer Skrip Blue-Black. I disagree with some of the other reviews that said this ink feathers easily on cheaper papers. For years, this was my go-to ink in my Pilot 78G pens, with their very fine nibs, which I would use on all sorts of paper and I never had any issue. But if you use this in a wet-writing pen with a medium nib or wider, then yes, you can expect feathering.Rohrer & Klingner inks perform well across the board. Good flow, good dry times, and are very easy to clean out of pens (unlike some other more popular brands that use heavily-saturated colors). They also write after long periods where you might forget to use a pen. This is why I often recommend them to those new to fountain pens as low-maintenance, good-performing alternatives to more popular brands that are a bit harder to deal with.

I received a sample of this in a recent INK DROP. I will be ordering a bottle in the future! Has excellent shading! Lots of character and still usable in the office or on formal documents!

This ink came in the January 2015 ink drop. I tried it out in my Metropolitan and I liked it right away. Probably ran through the first filling in a couple days (pretty quickly for me) and was trying to get the last few drops out of the sample. I ordered a full bottle and tried to conserve the last of the sample until it arrived. I don't know why I like this ink it flows alright and is super easy to clean but it's something about the color. At first glance it looks almost black but it doesn't take much effort to notice something else is going on. Once you really examine the ink it becomes clear it's a nice black - teal color. I think this is going to be my workhorse ink for a while.

The perfect blue-black! This ink has beautiful rich blue-black with subtle green hues in the shading. It is my go-to ink with such stately character that my other blue-black inks are gathering dust. It is the blue-black ink that functions flawlessly with good dry time in all of my pens.

This is a very deep color, somewhere between green, blue and black. In very wet pens it looks like black indeed, which reminds me the Noodler?s Air Corp, but the R&K Verdigris is pretty much easier to clean off. I think it could be a little less saturated. Despite of that, it?s a very nice ink.

This is a great dark blue color. The color of the liquid ink is very unique, but on the page it dries to a greyish dark blue. Wonderful!

Performs wonderfully on Rhodia, but feathers a lot on cheaper papers. This ink color reminds me of Iroshizuku Tsuki-yo, which I tend to prefer over Verdigris, especially since the Tsuki-yo displays no feathering on my cheaper papers. If you are looking for an ink comparable to the Iroshizuku yet at less than half the price, I would recommend this ink!

Great ink in one of my favorite everyday colors - a deep greenish blue-black. Almost a Doppelganger of Diamine Twilight, perhaps a bit more saturated (I have yet to try it out in a pen customarily inked with Twilight). Seems well behaved, too, but I have only used it in a fairly dry nib so far... Thanks to Brian for making the somewhat rare Rohrer & Klingner Brand available - it allows an old native of Germany like me to indulge in some germanisms!

Nice dark teal, lots of feathering., especially on lower quality paper. On Rhodia or similar, there's no feathering at all. I have this loaded into my 1950's Eversharp Symphony 713. I haven't cleaned it out yet, but apparently these inks are easy to clean. I like that characteristic, especially because it's in a vintage pen with a lever/sac filler, which my Noodler's Bad Blue Heron was not exactly easy to get out.

Blue green shading..good shading and flows well..can be used in business as an everyday ink...not water resistant.. Too bad.

True black green, just what I wanted in a black green. Will definitely get a bottle.

It is a very attractive color but in my Lamy Safari fine nib on Clairefontaine paper, the color leans more to blue than to green as it appears on the swab. Otherwise I would have given it 5 stars, (which I to date have only awarded to Iroshizuku inks). It flow easily and evenly and dries quickly with good saturation. It is very high quality.

The color of this ink is complex, unique, and altogether much more interesting than most blues. Additionally, it writes well in both vintage and contemporary pens, from what I've seen. I highly recommend this distinctive ink- I can't say enough good things about it.

I had thought this would be more green so I was like ah whatever (don't care for green too much) but after trying it I like the ending results. It was more like a dark blue grey in my opinion. It flows smoothly and nicely, is well lubricated. Looks good for casual or in the office place. Thanks Goulets!

This ink won't get more than three stars from me in its stock form, but when you diluted it it turns into a heavily shading, gorgeous muted green.

Okay, it's not waterproof, and moist hands, fingers, smears it. But that's it. And some people want their inks like that. For the rest, this ink shines. ...No, not the color. It's dark gray. If you try different lighting and look hard, you can see a blue-green hue. But basically, it's gray...Anyway, the smooth flow makes it a joy to write with. Definitly one of the most pleasant writing inks in that regard. And the pH is neutral.Next, it passed my 10-day accelerated fading test brilliantly. There is some change in the slight hue. The blue-green disappears and it becomes a more neutral gray. But the value doesn't fade. So this is a durable ink!What else do you need to know?The first Rohrer & Klingner ink I try, but definitly not the last. And this is a keeper. Particularly for my more expensive pens. Love it.

This is a green-black that really should be called black-green- yet there is also a hint of 'steel' to the color. A wonderful ink, but not for a somber letter.

I love the Rohrer & Klingner inks. This is an everyday standard for me--more interesting than black or blue, yet sober enough to substitute for either when appropriate.