Sailor Souboku Pigment Bottle Ink - Blue Black 50mL

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I’ve been trading off using Sailor pigment Sou-boku and Sei-boku inks, for the past 10-months, in my Sailor Dragon Palace MF pen, writing in my Hobonichi 2021 planner. Happy with these inks. They’re beautiful colors. Quite similar, but the Sou- is a little blacker-toned, the Sei- a little more blue. They behave well in the pens. I use my pen every day, but sometimes even leave the same ink cartridge for a couple weeks before cleaning it (with pen flush incl part ammonia), and neither of these inks gunks up my pen. As the days go on, the color of the ink changes a bit prob because pigment settles instead of fresh-mixed when filled. I don’t mind that color change. (Flipping back through prev. pages, can be hard to tell difference which was which sometimes.) I’m just happy that it writes smoothly and doesn’t gunk and is a lovely color (both of them are, I can’t pick a favorite). They are also waterproof once dry and dry fairly quickly too, — I use watercolor paints over them. These -boku inks are supposedly as non-fading/permanent/archival as fountain pen inks can be, and have survived light tests online better than most archival fp inks, which is important to me. I will prob keep writing with both these inks well into the future. I like these 2 sailor inks better than Noodlers (have tried many of their bulletproof) and maybe more than DeAtramentis Document Ink too, though I also use that.