The set includes three types of Kuretake inks. Sumi Ink and Black Ink refer to the traditional Japanese Sumi ink, the background in a liquid form. Thanks to this, they can be used directly from the bottle. The inks are recommended for brushes and nibs. Both inks are resistant to dissolution with alcohol markers. Kuretake white ink is well-covering, perfect for corrections and stopper work, as well as for painting and drawing on dark papers.