2. Glue and toner in solid watercolor pigments are mixed evenly and are not easy to separate;
3. From a practical point of view, three-dimensional watercolor and water brush are very convenient to carry and use, which is very suitable for short-term sketching or sketching of small works. However, users need to develop good working habits, keep clean, and pay attention to avoid mixing too many colors when mixing colors, so as not to cover each solid color surface with a layer of dirty dirt.