Sailor Souboku ink was designed for brush pens, but can be used with any dip pen or fountain pen with a converter. The glass bottle features a removable ink reservoir that makes it possible to use every last drop of ink. This is a pigmented ink with a deep blue color with a great depth. It is fast-drying with water resistant properties. Perfect for mixed-media and for use on heavier artist papers. This is a 50ml glass bottle of Souboku ink.