The cheap ones. I'm not really the most fastidious about pen hygiene, and I fret about the possibility of letting it dry out. So for me, thus far, it's been a stainless Baoer 388 and a Noodler's Nikita Eyedropper(predecessor to the Charlie; it has a blind cap the same color as the cap and section that screws onto the end of the barrel). I know I can pull the feed and nib out of the Nikita pen bare handed, and I'm pretty sure I could do it to the Baoer with just a Goulet Grip.
And frankly, IG inks don't really float my boat (at this time). I bought a bottle of Chesterfield Archival Vault. I tried it in two pens. It stained them both. The color didn't do anything for me. And I was getting perfectly adequate performance from Noodler's Heart of Darkness.
I do regard blue-black as one of the six essential colors. But the top contender for my blue-black ink is Pilot BB, and it's a total workhorse, which may well be even more fade-resistant than typical modern IG inks.
Sure, there's a bit of pen geek in me that found it kind of cool to be using the same sort of ink technology that monks used to save civilization. But I have better options than they did. I suppose if I had a firehose I needed to tame, and Pelikan 4001 Brilliant Black didn't do it, I'd have to consider an IG.
Edited by Arkanabar, 07 February 2016 - 13:04.