Give us a little insight as to how you use our JetPens products in your illustrations.
Depending on the job, I generally use either the Kuretake #40, the Sailor Recruit or the Sailor Brush Fountain Pen (either angle - they are both excellent!) I usually refill the cartridges with Platinum Carbon Black Ink and a syringe, which works really well with both the brush and the fountain pens. I've never had a clogging problem with this ink and these pens. It is good to get a nice uniform blackness throughout a drawing, so whether or not I'm changing pen halfway through an illustration, it remains consistent. Being waterproof and relatively quick-drying is a bonus, but I often use a medium Pentel Aquabrush to pick up some ink into a rough wash before it dries.