Ideal for artistic impressions, product design, illustrations, fashion designs, sketches, calligraphy or children's drawings, for thin, precise lines, expressive brushstrokes and for filling in large areas, odourless, water-based, quick-drying, clear, brilliant colours based on dyes and gum arabic.odourless, water-soluble, quick-drying, clear and brilliant colours based on dyes and gum arabic, colour intensity can be reduced by diluting with water or Brush Pen Blender, best results on light-coloured drawing and watercolour paper or cardboard.