The best feature is that you can express the deep monotone world. This writing material was developed with a focus on hue, brightness, saturation, and expression, based on the technique of ink making which was cultivated by a sumi shop founded in 1805. It can be used just like a facial color, and can be enjoyed by a wide range of people, from beginners to professionals. It is a great item that allows you to enjoy the color change and separation due to its shades.