Did you never get your tongue black chewing the school pens (the ones you had to dip into an inkwell)? Not particularly nice, but not easy to compare with anything you are supposed to ingest either. I suspect, from the smell of very young newsprint, that the solvents in modern synthetic inks are quite a lot nastier, and I'd prefer to avoid doing the experiment, thank you.
Stick to fountain pen inks; not pleasant, but at least we know they're not lethal, due to the large number of people who've absorbed them, and are still around.