Speedball’s rich, vivid calligraphy inks are formulated from the best pigments on earth. These high-quality inks can be used for a variety of techniques, enabling artists, students, and crafters to achieve the best possible results. Every Speedball Calligraphy Ink color is intermixable with the other colors in the range. Waterproof when dry, the inks are also acid-free and very lightfast. Individual colors come in 2 oz (59 ml) plastic bottles.