Ink Review #268: Sailor Sei-boku


We are continuing on with reader request week, so today's ink is Sailor Sei-Boku. Sei-boku is a nano pigment ink. I purchased my sample of ink from Anderson Pens


The color:

Sei-boku is a lovely blue black.


I love the depth this ink has. There's a few different shades of blue black and some interesting dark purple sheen in large swabs.


Let's take a look at how the ink behaves on fountain pen friendly papers: Rhodia, Tomoe River, and Leuchtturm.

Dry time: 40 seconds

Water resistance: High-I didn't notice any ink washing away.

Feathering: None

Show through: Medium

Bleeding: None.

Other properties: Medium shading, medium sheen, and no shimmer

On 20 pound copy paper the ink behaved well, no issues that I noticed.

Ink swabs for comparison, left to right (top to bottom for mobile RSS): Diamine Blue/Black, Sailor Sei-boku, and Rohrer & Klingner Verdigris. Click here to see the Sailor inks together.

Monteverde Azure Noir, Aurora Blue/Black and Birmingham Pens Kier Refinery Petroleum. Click here to see the blue black inks together.


Longer writing: 

I used a Waterman 52 1/2 then switched to a medium Pelikan M400 White Tortoise on Tomoe River paper. The ink had a lovely wet flow, it kept up with the flex nib really well.


I really like this ink in the flex nib, it had no problem keeping up with the wet flow.


Overall, I really like this ink. It has a lot of depth to the color, and has high water resistance. A bottle of it is going on my wish list. Give it a try, you might love it.

Disclaimer: I purchased this ink myself, and all photos and opinions are my own. There are no affiliate links on this page.