Pilot Ink Cartridges - Blue

I generally have at least one of my Preras or Metropolitans filled with Pilot Blue.

It is a no-nonsense economical ink with no pretensions of a Iroshizuku or a Edelstein. It also has the advantage of being slightly resistant to the occasional coffee spill.

If you are a student or a professional writer who refill their pens three or more times a week,you won't go wrong standardizing on this ink, especially if you purchase it in the larger container size.