Product Description SENNELIER DRAWING INKS: These shellac based colored inks are mixed with natural pigment providing a tremendous selection of high-quality colors that dry to a lustrous sateen finish. The 31 colors can be mixed with each other, and can be reduced with thinner for various techniques. They have a high degree of water resistance without being indelible. An excellent choice for drawing and calligraphy. Color shown here for reference only.