[Product size] 177 x 55 x 16 mm. [Content color] Brown, purple, blue, green, yellow, red. [Painting ink] A completely new paint ink for light painting made from the same ingredients as ink. You can express a deep monotone world with ink-based colors. Boku-Undo is a Japanese manufacturer that manufactures and sells calligraphy, art supplies, construction and gardening supplies, etc. Based on the ink-making technology backed by the tradition of ink-making for more than 210 years, We have been working on researching raw materials such as glue and soot, developed and improved products that are easier to use and expressive, and dispersion technology and synthetic glue. Boku-Undo is also engaged in research, development and design of versatile inks, and development of solid watercolor paints and water-based inks. Boku-Undo works to protect the global environment and contribute to and harmonize with the local community. Boku-Undo aims to make efficient use of resources, aiming to create products with less environmental impact, and is working to utilize recycled materials (Eco Mark) and promote green purchasing (Green Mark). Boku-Undo has been devoting itself to ink for over 974 years since its establishment. Incorporating new materials, technologies, knowledge and wisdom on top of a long tradition, we are constantly devising research and development of valuable products that satisfy the needs of the changing times while always satisfying our customers. Recently, in addition to various materials related to calligraphy, we are also focusing on developing a wide range of products such as textbooks that enlighten how to use and enjoy, building supplies, gardening supplies, and so on.