I use the black Platinum cartridge ink right now but it's running out fast (and expensive!). I'm also not really a fan of how light the color is and would like to try a different ink out.
- Works well with extra-fine nibs, need to be able to write kanji and small math notations
- Deep black, the darker the better
- Dries fast enough for general note taking
- Bonus points if water-resistant, but not necessary
I've heard good things about Noodler inks, but reading the reviews the bulletproof black dries really slowly. Would that affect how it works on EF nibs, or would another ink work better?