Sorry for the late posting. We are finishing up the school year and had a lot to do tonight. Today I used a Copic marker to shade around the SU ink. I tried it first with sponging the SU ink around the image but it was just not the right color. I used R81 and a colorless blender. It worked fine and did not smear the ink. This is the second time I used this set and I really like it. I sanded the stamps a bit so they gave a clearer image.