I used the highlighter markers, which did bleed a bit more than I expected, but not too much (though some of that is me not staying inside the lines with the fat-tip markers). I considered leaving the background white for a minute...
and then changed my mind. I colored the backgrounds as lightly as I could, and there's still a little bleeding, but I'm considering it a design element. BTW- there are no purple highlighters, I just needed *another color*, so I mixed blue and pink.
Why you want to work on a protected surface.
Pieces, including bag and vest lining, cut.