Quote Originally Posted by Jon Szanto View Post
I don't know about "old style" carts, but I can tell you for certain that current, new Plat carts fit these pens perfectly. I also used to keep one of these regularly inked with Sailor Kiwa-guro ink, which is a dark black, pigmented ink, and it was a perfectly good match for this pen. I used it in an index card file I have on all my pens. Thin, dark lines. Of course, I refilled carts with a syringe.
A bottle of Kiwaguro is in my ink box, and it doesn't get used much. I'll give it a try after I empty the cartridge of the fresh fill of Waterman blue-black.

Jon, I understand you've run out of space in your pens card catalogue.