Review: Iroshizuku Ku-jaku Peacock Ink


I am finally getting around to reviewing some of the dozens of inks I’ve accumulated. The first up was a random grab from the stash, Pilot Iroshizuku Ku-Jaku ($28 per bottle) which is a  bright peacock blue. I’ve been using it in a variety of pens over the past week. Its a bright, deep turquoise blue.


Pilot Iroshizuku inks are very lubricated inks. At least that’s what I first noticed about it compared with some of the other inks I’ve used like Diamine or J. Herbin. This makes it an excellent option for fine-nibbed pens like Japanese fountain pens. I also think it would be a good choice for finicky, easily-clogged pens or older pens. I’ve been trying out another Iroshizuku in some of my Esterbrooks and it works excellently.

On some lower-quality papers though, the inks were too too saturated and spread a bit.

The price seems steep but the colors are clean, flow well and super-lubricated. Clearly, its a worthy investment but good inks require good paper.

Tested on Quo Vadis Habana bright white paper with a TWSBI Mini EF and a Nemosine Singularity 0.6mm italic nib.

(via Jet Pens)

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  1. I recently took advantage of an Amazon sale on Iroshizuku ink. Was impressed with it but not sure twice the price impressed as my normal Noodlers/Diamine. But I found, as you did, the saturation is intense which to me makes for attractive writing. Thanks again for the review on a neat color

    1. I’m not familiar with this particular model but I do find that the Pilot Iroshizuku inks are great with Japanese fountain pens even the very fine nibs. If Pilot makes the ink and the pen, I think you are safe combining the two.

        1. Yes, I think Iroshizuku Ku-Jaku would work well in the Metropolitan. But paper will also affect the performance. More absorbent paper may cause the ink to spread. A good quality notebook like a Rhodia should do just fine.

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