Working on watercolor paintings using coffee grounds ("koffiedrab") on a coffee grounds background is one way of finding out how I can steer the 3-dimensional flow of the coffee dye. The small coffee particles in water create a flow of granulating rivulets giving the painting a 3D effect., Some of my Horses aquarel paintings came close, but there I used watercolor paint on a coffee grounds background. Now its coffee on coffee. Loads of caffeine. All are on Strathmore drawing paper, 400 series, 163 g/m2 A2. Some exemples.