Sailor Sou-boku from the Nano collection is a pigment-based unsaturated blue black with medium shading and a pop of black sheen in large swabs. It dries in 30 seconds in a medium nib on Rhodia, is water resistant and has a wet flow. Sailor ink is made in Japan.

Darker than the Sei Boku

• Can have a very long dry time in dip pens or wet pens.