On the way home from work I picked up some Bombay India ink (sepia) and a couple fountain dip pens. I wasn't sure if the India ink would smear with the watercolor I added later, and it seemed to have no trouble at all. Part of the reason could be the paper I use. I like using the dip pen very much, as the nib makes very fine lines if I want, and I love the scratching on the paper. Nice experience all the way.