1. Paint, stamp, or drizzle tar gel on absorbent, DRY paper. Here I'm using good, heavy watercolor paper. I could have painted it with light colors first if I had wanted to. You definitely should, for added interest!
2. When the tar gel is dry, wash over it with watercolors or any waterbased, diluted paint or ink. Here I also used non-permanent markers and added black accents with a pen.