Diamine Asa Blue vs Pilot Iroshizuku Konpeki Comparison

Pilot Iroshizuku Konpeki compared to Diamine Asa Blue

A comparision between the Diamine Asa Blue and Pilot Iroshizuku Konpeki inks. They are both vibrant blues but does Konpeki justify its price tag?

Pilot Iroshizuku Konpeki vs Diamine Asa Blue Swatches

Ink Colour

As you can see in the picture, they are very similar colours. I did a heavier swatch of Asa blue so it comes across a bit darker, but they are very similar in real life. Asa blue appears to have more of a green tinge compared to Konpeki which is a true blue and perhaps is a slight bit more saturated. In pens, this is barely noticeable. They both don’t typically produce any sheen, but when piled on there can be a slight red shift on both. In most nibs, you can’t really tell them apart.

Cost comparison

Cost wise, Pilot Iroshizuku is substantially more expensive with it being around $30USD for a 50ml bottle. A 80 ml bottle of Diamine ink will set you back around $15USD or £5 or £6 pounds. The difference is price is pretty obvious. Diamine and Pilot both also sell their inks in smaller bottles with the Diamine being 30ml and pilot is 15ml.

Ink Behaviour

Performance wise, I find the Pilot Iroshizuku has a slight edge. Both perform admirably, so I’m really nitpicking now for differences. I find the writing experience with Konpeki, slightly smoother and I like the ink flow better. Asa blue feels slightly rougher? (not quite sure how to describe it). Both of them aren’t very water resistant and as a result clean out of pens pretty easily.

Pilot Iroshizuku Konpeki and Diamine Asa Blue Ink BottlesThere is definitely a clear difference with regards to the packaging, though. Both bottles are practical, but Pilot Iroshizuku definitely wins the race, as the glass bottle looks feels great without sacrificing usability (I’m looking at you J Herbin 1670 and Sailor). While the Pilot bottle feels heavier in the hand, the Diamine bottle actually holds more ink. If you want something you can display on your desk or make a statement then go for Konpeki. Both bottles are easy to fill from.

I have a full review of Pilot Iroshizuku konpeki, if you wanted to know more about this ink.


Overall I have to say that Diamine Asa blue wins the smackdown. The inks are close enough that you can mistake one for the other and you get more ink for a better price. That being said, there is just something luxurious and premium with Pilot Iroshizuku inks and they never disappoint. It all comes down to budget and personal preference, but I hoped this informed you a bit. Maybe you might even get both like me! 🙂

Diamine Asa Blue vs Pilot Iroshizuku Konpeki Comparison

6 thoughts on “Diamine Asa Blue vs Pilot Iroshizuku Konpeki Comparison

  1. Kon-Peki is my all-time favorite, but I agree with you when it comes to cost. Personally, I prefer the shading on Kon-Peki to Diamine’s Asa Blue, which is why I have the pretty bottle in my collection. But if it’s cost you look at, go for the Diamine.
    Thanks for that post, it is very informative 🙂

    1. Konpeki definitely has some nice shading and something premium about it but it’s hard to beat Diamine on value. That being said, my Iroshizuku collection is slowly growing.

      1. see, it’s sneaking into one’s collection, and there’s not much one can do about it 😉 I know the trouble. But I also really like the Diamines. I’m currently testing Sherwood Green and I’m definitely gonna get some.

  2. What a pointless comparison. They are nothing at all alike, but in true fountain pen blogging style which is a mix of boredom and follow-my-leader someone colour-blind once said “they are similar” so everyone mentions it, natch.

    Kon peki itself is the most overrated overhyped ink in existence. It’s the go-to blue for every Montblanc aspiring, Goulet subscribed moron that ever declared fountain pens are their new hobby.

    It’s the kind of fool who pushes artificially affected speech in their comments like “one does”: Amusingly enough has “gunna” in the same comment.

    The only thing luxurious about Kon Peki is the quality of paper you end up receiving on your final demand bill.

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