Iroshizuku Yama-budo (Crimson Glory Vine) is a bright magenta purple fountain pen ink. There's a reason that this is one of the most popular fountain pen inks in the world: it's a unique, bright color that is a joy to use and has gorgeous shading. Some part of me suspects that when we buy our first fountain pen, we secretly sign an agreement to one day buy, use, and love this ink.
Pilot's Iroshizuku line of fountain pen inks are the gold standard for a reason. They're well-behaved, wet-writing, generally quick-drying (<20 seconds), and come in an assortment of stunning colors. Because of how Iroshizuku inks tend to be, they can often be some of the most reliable inks to give you a great writing experience with dry-writing pens (think Japanese <Fine> and <Extra-Fine> nibs).
The only place I'm careful with them is in vintage sac-filling or celluloid pens: Iroshizuku inks can be quite alkaline, which can harm these sensitive vintage materials. See my guide on vintage-safe fountain pen inks for more information.
