Okay, brain is hyperdrive these days, so here's yet another interminably dull-witted question from a far-away noob.
What factor/s make an ink feel smooth?
Reason for asking is that I just flushed some ink from a pen with a Jowo broad cursive italic nib (courtesy of, in my opinion, one of the great nib grinders at FPNibs.com). That ink felt dry and seemed to give the nib a sense of being dragged across the paper (Rhodia for those who have waded this far). Now I've just loaded the pen with a different ink - same nib, same paper - and it glides along with a genuinely velvety feel to it.
So, what gives?
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