Liquid watercolors in a practical brush pen format. Ecoline liquid watercolors. Contents: 5 brush pen markers in primary colors. The colors are not waterproof, allowing for continuous work at any time. They adhere excellently to watercolor paper or drawing paper. The liquid Ecoline brush pen watercolors from the brand Talens are ideal for artistic impressions, product design, illustrations, fashion designs, calligraphy, or children's drawings. Since Talens Ecoline does not dry waterproof, you can always continue your work by re-wetting already dried colors.