Seiboku (Blue Ink) Seigen Genrin-do, from Heisei 10 (1998). Regular ink is made from glue and soot, but Seiboku (blue ink) generally contains indigo (hon-ai) in addition to glue and soot. Because of this, it has a unique pale color when used diluted. High-quality black ink, perfect for calligraphy supplies. - Brand: Seigen - Product Name: Ink - Color: Black - Packaging: Boxed Thank you for viewing.