This is in my opinion the perfect basic blue ink. Back in school I always loved using the Pilot Precise V5 (or V7) blue pens. This ink lets me have that same color but use it in my nicer refillable pens, whether it be my Monteverde MVP rollerball or one of my many fountain pens. I love this ink both for the fact of its nostalgic color and for its professional appearance when being used in the office. This is hands down my favorite ink.

This ink is beautiful and behaves nicely. It's not quite a conventional blue, but more a blue/indigo color. On my Clairefountaine paper, it glides on the paper and drys decently fast.

Iroshizuku makes one of the nicest inks available, and this has become my favorite color. It can be used in either formal or informal settings, and is wet enough to work well in most fine nib pens.

This is my first bottle of iroshizuku and I have become obsessed with the quality and colors. I now have added four more. Just amazing colors and such variety to find the EXACT shade I really wanted.

This ink is a beautiful color. I’m partial to blue and this is my new favorite. My eyes are drawn to it on the page. I have only fine and medium nibs and it is vibrant in both.

Perfect for my pilot retractable pen

Elegant bottle! Looks like it should be a container for very expensive perfume. Color perfect. Great service and follow through.

Beautiful shade of blue 💙

This seems like very good ink. It went smoothly on copy paper with a Pelikan pen having a medium nib.

Great Color,would, and likely will, buy again

Iroshizuku ink is great and cleaner are awesome.
Thanks for lollipop

My second bottle, just perfect darker blue, out of the 5 darker blues I have this is my go-to!

Its a Pilot Ink. This ink is just like the other Iroshizuku inks that I have used. The ink is wet, but doesn't bleed through the paper and it behaves really well while writing.

Love this shade of blue. Well packaged. Fast delivery.

Really like the color

But the bottle is beautiful!

The color is deep and rich, exactly what I was looking for.

A very nice blue-black ink that makes good contrast with paper. As expected the ink is a very high quality and flows well. I’m on my second bottle.

I love this color. I’m using this in a Pilot Vanishing Point with a fine nib. It has been running wet and I’ve had no issues with the nib drying out.

The color is marvellous, hands down. A pleasant saturated blue. Shading and sheen are minimal, hence there is almost no smearing and it is very pleasant and easy to read. Combining all of this could have made this ink a perfect everyday blue. But it feathers INSANELY. On every kind of paper: from the cheapest copypaper and all the way up to Tomoe River. Which, of course, instakills any joy of using it. Only by going down from Visconti's M to a Japanese F nib could I make this ink behave in more or less acceptable manner. And even then I had a glimpse of feathering.

A huge and totally unforseen disappointment.

Gouletpens, though, is 5-star, as always. Keep up the good work!

Heard good things and yes it feels very smooth like your writing with WD 40! And the color blue is clean and bright not dirty- very pleasant

Beautiful, smooth ink.

This ink pairs perfectly with the Pilot Custom Heritage 912. The color is great and the flow is awesome!

I'm using it in my TWSBI Eco fine pt., and it is a lovely ink - very smooth, dries quickly, does not bleed through regular copy paper - which is what I use at school for notes. Does not feather, either. And, of course, I love the design of the bottle.

Iroshizuku is the best ink I've ever used, Asa-gao is a beautiful royal blue, and I love the service I get from Goulet!

A gorgeous deep, rich blue. Works like a charm in the Lamy 2000.

What a gorgeous ink. Not too dark but dark enough to be used in any situation, it flows beautifully, dries in a reasonable time and paired with my Custom 912's Waverly nib, it's the slickest, smoothest writing combination I own -- like the were made for each other. I doubt I'll even put anything else in the pen. I write a LOT and the Asa-gao adds a bit of beauty to all the scribbling. (And isn't that why we use fountain pens?)

I bought this ink because I wanted something purple and this seemed to fit the bill. Even the color on the label indicated a real lilac purple color. However, when writing with it, it looks more blue. That said, it's a really rich and pleasing blue! I think I like it better than the 2-3 regular blue inks I have.So if you want a true purple ink, you might want to look elsewhere. But if you want a really rich darker blue, this is a great choice.

One of the most well-behaved blue inks I've ever used.

A definite go to ink for me. This ink, in my experience, has provided useability in almost every function. This is an ink that I can trust not only in my everyday workhorse pens, but also can rely upon its beauty and safety in even the most delicate of my calligraphers. Such a great ink and in such a beautiful color. You may note that, in some thicker nibbed pens, it has the tendency to appear lighter at the beginning of a stroke than at the end, and although many see this as a negative I believe it only adds character and personality to the document.

My wife bought me this ink for Christmas. It is a beautiful darker/navy blue. Flows well and looks great on all the paper types I've tried.