In December 2007 Pilot's created exclusive line of inks called Iroshizuku. I believe they may well be the most well known fountain pen inks in pen world. These inks are supposed to work in any pen with any nib on any paper and in any situation. I haven't tried all of them but so far the Iroshizuku inks I've tried were behaving flawlessly. The colors were created by Kiyomi Hasegawa who after fifteen years of working in a stationary shop and communicating with Clients come to conclusion that