Spectrum Noir Aqua Artist's Water Based Dual Nib Marker Coloring Pens Spectrum Noir Aqua is the water-based artist's marker. Each Spectrum Noir Aqua Marker is dual tipped. Using water these pens will diffuse and seamlessly blend. The pens are acid free and give a stable and long lasting color. They are also odor free. Spectrum Noir Aqua is the water-based artist?s marker that goes wherever your creativity takes you. From sketching and illustration to layout and design, to Manga and Comic art, and paper-crafts too. Whatever your style, the Aqua marker combines the performance of water-based color medium with the easy to use convenience of a marker - to give you outstanding color results. Each Spectrum Noir Aqua marker is dual-tipped - at one end, there is a soft brush nib for flexible line control and a more natural art surface feel and at the other a precise fine tip for definition and accurate line work. These fantastic water markers are a great addition to conventional water-based paints and other color media. The high quality dyes give flawless, even coverage with all the definition and vibrancy you need. Using water you can diffuse and seamlessly blend color to create the lifelike tones and subtle touches that will bring added depth and realism to your work.