Graf von Faber-Castell Cartridges (Box of 6) – Cobalt Blue
Cobalt blue is one of the Graf von Faber-Castell ink colors which are inspired by nature. The inks are crafted with the highest quality ingredients. These cartridges are International Standard, and will fit in pens produced by Faber-Castell, Kaweco, and Pilot. Each of the Graf von Faber-Castell inks are 100% Document proof meaning they are smudge proof, waterproof, light-fast, cannot be erased and resistant to many chemicals and solvents.