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Other important questions: -

Other important questions:
- How thick is the ink? Usually waterproof inks are thicker and do not flow as well with brush and can be sludge to a fountain pen.
- How dark? Typically waterproof inks are darker, but that may not matter to an artist who darkens lineart digitally.
- How fade resistant? You don't normally have to worry about this so long as the ink is a true India, but as with sites falsely saying the Pelikan ink is waterproof, so is there confusion about what is really India ink. I always test new inks and pens on a paper strip and leave it out in the sun to see what the effects are. I once had an ink that turned sepia in less than a month!