Founded in 1915, they have been dyeing only the traditional Japanese formal wear, kuro montsuki, for 100 years. Under the current fourth-generation owner, Tetsu Arakawa, they developed a unique deep black dye called "Shinkuro," unmatched in the Western fashion industry. They provide black dye processing for various apparel brands both domestically and internationally. Additionally, they have established a "re-wear culture," upcycling unwanted garments by dyeing them black.