In the center of this picture is a blue and white striped bead:
When I took this picture, the bead was simply rolled and ready for glazing. I used a blue magic marker to add color to the paper before rolling it up. Note how crisp the blue and the white is on the bead.
Last night I added some Mod Podge to this bead. Given that magic marker is water soluble, it ended up with a rather watercolor looking wash to the bead, like so:
Which does look nice, so I might very well continue to use this technique, it's just that I'll have to be aware of how this ink responds under Mod Podge.
I also noticed that highlighter ink doesn't seem to do this. I wonder if using Sharpies, which are not water-soluble, will also remain colorfast when Podge'd. Hmmmmmmmmmmm.......