got Salix inked MB146 in my pocket right as I write this! It's a really nice ink for higher end pens (I probably wouldn't dare putting it into anything with a steel nib).
If the long-term properties / resistance of the ink are important, R&K also makes one of the few archive grade inks - their Dokumentus. A bit more expensive, but still affordable compared to alternatives. It's nice, but a bit higher maintenance than the Salix / IG inks. I think part of the permanence is achieved by some powder emulsion, so long term storage of an inked pen can be an issue (past maybe a month or so, or even a week in hot and dry weather).
If the long-term properties / resistance of the ink are important, R&K also makes one of the few archive grade inks - their Dokumentus. A bit more expensive, but still affordable compared to alternatives. It's nice, but a bit higher maintenance than the Salix / IG inks. I think part of the permanence is achieved by some powder emulsion, so long term storage of an inked pen can be an issue (past maybe a month or so, or even a week in hot and dry weather).