Ecoline Watercolor Brush Pens features highly intense, saturated dye-based liquid watercolor that dries within minutes, can be rewetted and is blendable. It produces great results on paper or board. It's flexible brush nib allows for a wide variety of thin and thick lines and strokes. These pens are not lightfast, so store artwork in folders or out of areas with high/intense light to give the best protection to the colours fading over time.