These markers are ideal for work involving illustration, design, calligraphy, or simply color studies. They adhere perfectly to watercolor paper, drawing paper, or cardboard. The fact that the ink is not waterproof allows you to rework it once it dries. You can create fine, precise lines, energetic strokes, or dilute the ink to create colored washes, or fill large areas with color. The ink is odorless and quick-drying. For better color preservation, store your work in folders.