Holly McLean shares her monoprinting technique in the February/March 2012 issue of Quilting Arts. Here is another detail of her quilt, "Mystic Woods."
I know mono means one, but do you ever use the gelatin over again? Is there a way to clean off the dye and do another print?
Yes, I just twipe off the gelatin with a damp cloth and add more paint. You can keep doing that as much as you want.