KWZ Iron Gall Blue #4. Despite the name, this ink is gray. Not blue-gray, really just gray. It’s got KWZ’s usual nice shading, and usual easy clean-up. I like it best in a wetter writer, to darken the color.
An everyday ink? Well, in that category, I’ve already got Pilot-Iroshizuku Kiri-same. Also Montblanc’s no-longer-available Albert Einstein ink. And I really liked Kaweco’s new Smokey Grey, too, although that’s lighter in color.