Cover large sketching areas quickly, variegate tone subtly like watercolor and more. Derivan Liquid Pencil allows artists to create authentic graphite pencil effects and pencil sketches using a liquid. It has been formulated to be easily thinned with water or acrylic painting medium and to allow artists to apply the softest of colors with a brush, nib, or other art tools. Due to a precisely balanced formulation, the permanent liquid pencil will burnish up in a similar manner to traditional graphite but it will not smudge. The rewettable formula allows artists to remove areas using water in a manner similar to watercolor techniques or with a traditional eraser. This 12-tube set includes 12 ml tubes of gray 9, gray 3, yellow, blue, red and sepia in both permanent and rewettable formulas.