Amsterdam Acrylic Ink is available in 46 brilliant colors! All colors are highly pigmented ink and are extremely light-fast. The ink is based on an acrylic resin and is waterproof when dry. Ideal for a wide range of techniques like calligraphy, watercolor, airbrush and can be used with technical pens. Amsterdam Acrylic Ink has been specially designed to use them in combination with the Amsterdam acrylic paints, markers and auxiliaries!