I color in three ways. 1) I'll put some color on one side of the Q-Tip and soak up some staz-on cleaner on the other side. Then, blend on a scrap sheet until I get the color I want. 2) Soak in the Staz-On and then pick up the ink from the marker. I don't think it matters much except the some colors seemed to work better one way than the other. 3) Really soak the Q-tip in Staz on Cleaner, rub it over the area of the tile I want to color, then use a dry Q-Tip with Sharpie ink on it to color. This gives a more color wash effect.