Love this dark rich opaque black. Flows great and drys fast. A very nice dark black

Very well behaved on paper, as I've come to expect from Diamine ink. Does fade a little bit more gray and probably not the darkest black you can get your hands on but really solid performance at a very fair price.

Fast delivery and a great care package sent with my order. Thank you Goulet Pen! I'll be ordering from you again.

Onyx black here is like the best jet black to my eyes. Smooth sailing and gorgeous true black. My eyes see no hint of grey. Just what I wanted.

Only 2 fountain pens. Ink flows great. Very satisfied.

The bottles of ink arrived safely...well
packaged. It is one of my favorite black inks, so am now well stocked.

What can I say? Very black, flows well, cleans up easily. May be come my go-to Black ink.

Have been searching for deep black and like this one a lot.

I was hoping this would be a good black ink for daily use, but as a left-hander it's a no-go. It smudges far too easily in my Leuchturm notebooks.

Great ink for my TWSBI

It seems Diamine always has good ink at a good price

Excellent experience. I am a newbie enjoying all the diamine inks.

I really enjoy this ink! I find it to flow very well, and give me a consistent, saturated line. This is what I want in a black ink.

This was my first time using a fountain pen inoh, about 62 years! So, I can't really critique the ink since I don't have anything to compare it with. I've smeared it a few times, so I guess I wished it dried faster, but overall I love it!

A great black ink for my needs. I have three pens inked with Onyx Black. Performs well, very legible on different paperd.

So, as a long time Skrip Black user, I have been trying to source a replacement as, once again, everything about the ink has changed. I loved even the Slovenian iteration of that ink, but now it seems the future of Skrip is questionable again. That ink is so wet that it doesn't really need to be super saturated. It always appears dark on the page. And of course like any wet ink, it bleeds a bit on most paper. Spoiler alert: This ink is not a replacement for that (I definitely think Kaweco and/or Sailor black are actually better at doing what Skrip Black does than Skrip Black). But in my searching, I found I really love this ink. It's not nearly as wet as any of the inks i previously mentioned. Closer to Herbin Perle Noire, but with a slightly velvety texture (almost oily) that I just love. It might even be darker than the Herbin. I don't understand how this ink isn't talked about much by high-contrast-black-ink-fans - especially given its price. It's a new favorite in italic pens, where previously I might have used Perle Noire: The viscosity of the ink means I can take my time lettering carefully, without fear of terrible bleed. It's as well behaved as any Diamine ink, which is saying something. Much more so than other blacks I typically use. Note: I abhor waterproof inks so please take it into consideration that I have not taken that aspect of this ink into consideration.

Wonderful writing experience. I wanted more than the basic black so I went with this and I love it.

Love it, very smooth, very solid color, no bleeding through

Great, this has a very nice sheen to it and is a better looking black than other blacks out there. It is a perfect workhorse black ink that flows nice and dries fast (at least through an extra-fine nib). Used primarily for note taking and journaling.

Normally I draw with waterproof ink because I use watercolor. But occasionally I want to use ink that I can wet and use to shade the drawing. This Onyx is perfect for that. It's a good, dark black but blends with water for interesting shades.

Very good quality, will be using for a while.

I've been writing mostly on cheap, thin paper, and I haven't been experiencing any bleed-through or feathering or anything like that. It's a good dark black, and it dries pretty quickly. Definite recommend!

I love this ink!

This is the first ink that I've bought, so I don't have a frame of reference. Overall, it works pretty well. The flow gets dry if you leave the pen out (uncapped) for a few minutes without using it, but maybe that's normal. It takes a few seconds for the flow to start again.

I bought a few different black inks so I could discern which one I prefer! Some I bought online and some from my local stores. After going through a converter of each, this ink has ended up on top for me. I was looking for an ink that I could utilize anywhere and at any time no matter how formal/informal the occasion may present. I tried this ink in a Pilot Metropolitan and a Platinum Preppy that I use for work and school-cognate activities since they're so affordable. The ink performed great in both pens! In the Metro, it was a little wetter when being compared to the Preppy, but that is most likely due to the EF nib I bought with my Preppy and the size difference of the F from the Metro. Ink flows smooth, showcases sharp lines, and profoundly expeditious dry time. All this together makes my writing very professional. Amalgamate all the above with the fact it's only $7.50 per 30mL bottle, even if you end up not loving the ink, it's so frugal that it is almost a must-buy! - I definitely recommend this to anyone who is in the market for a type of black ink and looking to change it up from 'Noodler's Heart of Darkness!'

I have sampled a few inks, but i feel that this ink flows very well in my twsbi eco. Good and wet ink.. Very satisfied with purchase.. plan to buy more in future. I think i may be switching to this ink as my primary ink...

I have over twenty-five bottles of black ink. I have not found a non waterproof black ink that does better, and few match it. Three or four might be about as good. I'm not good using the scale review system so what I put down on it is meaningless.

A delightfully rich black ink. Great flow like most Diamines. It quickly became my go-to ink for everyday writing in literally any setting.

I purchased this after watching the The 7 Biggest Fountain Pen Mistakes video on Youtube. As a new fountain pen user this ink was a good buy and I'm glad I watched the video otherwise I would have used the wrong type of ink.

Love how deep this black is, strong saturation, just what I was looking for in an ink for work!

I received this ink as a gift and I love it. It is the perfect shade of black and dries fairly quickly.