Kuretake ZIG CLEAN COLOR Real Brush 6 colors set ‘Portrait colors Ⅱ’ for illustration, design art, lettering, calligraphy, drawing. Manufacturer: Kuretake. ZIG CLEAN COLOR Real Brush is a brush-type watercolor pen, so it can be used in a wide range of applications such as illustration, design, lettering, and Manga; Because it is a water-based dye ink, you can blur it with water or mix it with other real brush colors or a blender.