A striking and beautiful blue

Shin-kai is a gorgeous dark blue and writes very well on Rhodia and cheap stuff alike

It's a great blue

As most of these darker blue's are, it's not remarkably different in color or tone to the others when used in a fine point or on cheap paper (although with spread, you can see more clearly it's unique tone), but I still see enough of it's special color that I really enjoy using it

Shin-Kai is a very dark slightly grey blue.

I ordered this ink on a quest to find the perfect blue

Color is almost turquoise instead of pure blue, but that may be because it is so light.

ink is a basic dark blue - not as much character as some of the other inks in the iroshizuku series, but good for everyday use.

Lovely bright blue that writes brilliantly

The color is very nice, a somewhat light-dark blue (I know it sound almost like a contradiction in terms, but it is not.

and it's a nice dark blue

It's a beautiful teal/peacock blue

They all look great, it is almost like getting several blues in one.

A great blue

It's a gorgeous azure/cerulean blue

It’s a very beautiful blue

It’s dark enough that it can be used in professional settings, but it’s not a stuffy blue by any means

I found that this blue is not too dark nor is it too light, but a great middle blue, perfect for professional work documents

A really nice vintage look on paper, and although it is lighter in tone than a dark navy blue, this shade stands out on white paper

This ink also lends itself to good shading, going from dark blue to lighter blue.

Good blue is so subjective, hard to get what you love, so many shades, so many nuances of the 'perfect' blue.

A beautiful blue.

I was looking for a stylish, dark-but-not-too-dark blue, and Tsuki-Yo is exactly what I meant

the most beautiful dark blue with green tint, lots of shading

love the grey-blue.

A very nice blue

very nice deep blue

Shin-Kai is a beautiful dark blue

It isnt too colorful for everyday writing at work, like the sky blue, but still looks a little bit more distinct because of the slight shading from moderately light blue to dark blue

Beautiful blue, fairly wet ink

First off, I bought kon peki - a nice blue that can be used for every-day, but fun enough to not get boring!Shades well

Shin-Kai is a beautiful dark blue

the most beautiful dark blue with green tint, lots of shading

The ink dries to be a pale, slate-blue

This blue is a work of art

Beautiful blue

For reference, my next two favorite blues are Private Reserve DC Supershow Blue and Noodler's Ottoman Azure.

The bottle itself is a work of art, but when you see the most beautiful blue come out of it you'll smile.

I found that this blue is not too dark nor is it too light, but a great middle blue, perfect for professional work documents

It's a medium bright blue, fairly saturated and more greenish than purplish, but almost in the middle of the scale between greenish and reddish blues

The ink also fades to a much lighter blue then is indicated, so be prepared for a brighter blue

It is a nice bright rich blue that is dark enough to write with daily but not so dark that you would ever mistake it for black

A beautiful blue, looks great on paper

He loves the deep blue.

The color is a dark blue and it’s such that it gives you a nostalgic feel to it

Color is a perfect deep blue, almost black

Of all the inks, I prefer the blues, because they are vivid and yet you can write a note and not have the recipient squinting at the writing saying "what?!?

greener, more shifts it to a darker blue

It comes out with dark blue in the beginning, but in few letters after, it turns into more clear light blue

Asa-Gao is a beautiful blue

definitely my favorite blue.

and it's a nice dark blue

Doesn't share much, but is a nice blue that glides across the paper and dries very quickly.

This color is a classic blue, exactly what I was looking for!

If you are stuck using blue ink for work, this is a beautiful blue

excellent product, beautiful blue.

The color is a very nice, work appropriate blue

ink is a basic dark blue - not as much character as some of the other inks in the iroshizuku series, but good for everyday use.

Shin-kai is a gorgeous dark blue and writes very well on Rhodia and cheap stuff alike

Kon-peki is a beautiful cerulean blue

It is a very nice blue.

A striking and beautiful blue

It's a strong blue with violet tendencies that I'm using in two pens at the moment.

In my fountain pen barrel it looks dark blue, but comes out to a light blue on paper

Not really a business writing blue, but not so wild that it couldn't be used in a pinch.

This ink flows well and the color is an intense dark blue

If you're prone to spills and want a good blue, this is a great purchase.

It's a beautiful blue, but honestly not sure if the price is warranted, there are other inks for half the price that show up better on nice paper

It's a vibrant blue even for a dark blue ink.

It is an elegant dark blue, dark enough to be similar in feel to your basic blue black, but it is most definitely NOT your basic blue black.

The ink is a rich blue, with a deep bright color.

Nice rich color blue!

Asa-gao, purple blue is a rich darker cool blue

I expected a deep dark blue, i was way off, i will stick with kon peki, that is beautiful!

My go-to favorite blue, hands down.

It is the most beautiful bright blue not to mention that it writes so smooth

It is akin the the classic blue that standard business pens come in with more intrigue

This was not quite the vibrant blue I expected based on some of the pictures posted by other reviewers, but it is a very nice blue-black.

This is a very vivid blue that sparkles from the paper

Seeing this blue will put a smile on your face.

The blue is a lovely shade, and with the right paper you will really enjoy it.

If you love the color blue, you can't go wrong with this one.

The color is a dark blue, almost black, but noticeable

It is an elegant dark blue, dark enough to be similar in feel to your basic blue black, but it is most definitely NOT your basic blue black.

A very vibrant color, I would call it a Royal Blue (very beautiful)