Drawing Ink is ideal for outlines, technical drawings and shading and can be applied directly on the surface to obtain a result of high contrast; or diluted with water to achieve graded effects by the application of several layers of progressive intensity of color. Pens, brushes and painting tools can be cleaned with water. For fine pens, it is recommended to use absorbent paper to clean the pen immediately after use, and not allow the ink to dry on the tip. For brushes, clean up with water and dry thoroughly.