Hahnemhle Watercolor 300 and 640 set new standards for high-quality watercolor papers. A carefully chosen variety of cotton offers extremely strong fibres and incomparable purity. The selection of the best raw materials and exclusively natural filler materials gives the Watercolor 300 and Watercolor 640 papers their unparalleled quality. The prized cotton papers, Watercolor 300 and 640, are characterized by a very durable paper surface that is well suited for demanding watercolor techniques.The fibres do not lift, rub off or loosen, even when applying multiple layers of color, or when using masking fluids and tapes. This paper lets you use the most beautiful colors and create remarkable wet-on-wet paintings.