I remember using Sheaffer Skrip on my old DJ500. It worked every time. I
wouldn't consider trying it on the newer printers like my three Canon's but
I do a lot of refilling on these printers with Sensient- Formulabs ink from
www.alotofthings.comand and it works perfectly. Your post mentioning using
different colored fountain pen ink made me think of doing just the reverse.
Instead of putting fountain pen ink in an inkjet, how about using refill ink
in a fountain pen? I occasionally like to use a fountain pen for writing
checks and other documents instead of a ballpoint. I wonder how well the
refill ink would work in a fountain pen? Some interesting colors could be
achieved by mixing a few drops. I haven't tried it yet, but when I get a few
spare moments, I just might give it a shot.