Ink Review - Sailor Seiboku

Hello, I’m Chrissy, and today, for The Writing Desk, I’m reviewing Sailor Seiboku nano pigmented blue-black ink. From other sources I believe Sailor has now removed the hyphen, so I've changed it to Seiboku.

I started writing with a Lamy M nib, but found Seiboku looked more saturated with my Parker 45 cursive italic nib.

I was surprised at how blue Seiboku is. It’s more like a dark blue ink that almost leans towards teal than a traditional blue-black ink. It’s an attractive dark blue colour, but doesn’t have much black in there.

Seiboku has medium saturation and wasn’t so saturated that I couldn’t see the lovely shading that it exhibits. It also occasionally exhibits some red sheen with wetter flowing nibs.

Flow was good, as was lubrication across the page. The ink felt reasonably wet and smooth to write with. Lines were all very crisp with no signs of spread or feathering.

It didn’t suffer from any hard starts or non-starts when I put the uncapped pen down to do swab tests, dry times and water resistance.

It dried within a normal range of 16-18 seconds on the Clairefontaine Triomphe paper and didn’t smear at all after it was dry 

I didn't experience any clogging in my pens and saw no "crud" on the nib, but I didn't leave this ink in my pens for a long period of time.

Clean-up out of my pens and converters took slightly longer than normal, and I used warm water with a drop of liquid detergent added, but it washed off of my hands with one wash. 

It is completely waterproof, even under running water.

Available in Sailor 50ml glass bottles and cartridges.


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