The right paper for the watercolor technique (watercolouring) is the necessary basis to achieve satisfactory results with water colors (e.g. Gansai Tambi from Kuretake) and water-based colors and pens (Tombow pens, Zig Clean Color Brushes). Find watercolor paper from Winsor & Newton, Fabriano, CraftEmotions, Ranger and other manufacturers here.
german