Originally Posted by lisaastrup
Can they be used like watercolors or is it more like drawing / lines ?
Flick it, stab it, long luscious lines, short sharp shocks, air brushed, water-color-like glazes and washes, scratched, wet in wet, wet in dry, and even painted opaquely or transparently. Mix and match.
Acrylic inks, for example, can be used kind of like ultra-staining watercolors (well, the more transparent ones at least). One ink might not accomplish all the different styles possible, but it's a broad category if you don't get too hung up on the "pen" part, and even then...!