The new Goldfaber Dual Aqua Marker, Indantherene Blue opens up all sorts of design possibilities because the dye-based ink is fully water-soluble. Each marker has a soft, flexible brush nib for painterly brush strokes and a metal-encased fineliner tip (0.4 mm) for details and contours. Dye-based ink markers are perfect for calligraphy, detailed watercolor painting, dry brushing, sketching, coloring, and more! The paint is in the marker! To start creating mesmerizing watercolor artwork, you simply add pigment to the paper and then add water with a brush.