Markers can be used like watercolors by applying them wet but they dry instantly. They allow for realistic colors without mixing and are compatible with other media. Markers can be used on many types of paper including carton, tracing paper, and butter paper. To create gradual value changes, apply lighter markers vertically over darker ones while still wet. Gray markers can also be layered up to three times to create shades from dark to light. Technical tips include outlining drawings in black if the original ink bleeds, using thinner pens for smaller drawings, and applying two coats of color with waiting time in between to darken values.