The William Mitchell 80ml bottles of Fountain Pen Inks are dye based for use with most fountain and cartridge pens.
Available in 3 colours, Jet Black, Sepia and Blue.
I wanted this for use in a fountain pen that I had recently adapted with a very flexible 'comic' nib. It proved to be a good choice. David Fright (Bognor Regis, United Kingdom) on 28 Jul 2018