Rohrer & Klingner Document Ink 50ml Ink Colour:Dark Blue The refill is the OHTO

The refill is the OHTO PG-105NP

Koh-I-Noor brilliant watercolour set with 24 extra rich highly soluble colour shades

or bottled ink with the supplied converter

which provides durability and lustre to the surface

Monteverde Ritma fountain pen

Rohrer & Klingner Document Ink 50ml Ink Colour:Dark Blue The refill is the OHTORohrer & Klingner have been making ink since 1892, and by hand, too, using well established recipes. Their Document ink is permanent and archival, and is guaranteed suitable for use by registrars for official documents. It is suitable for use in fountain pens; Rohrer & Klingner advise that the only care needed is to ensure that the cap of the pen is replaced when not in use, to prevent nib blockages. Each bottle contains 50ml of ink.