Each coloured ink of the four pens is made of natural dyes: indigo, chlorophyll, gardenia and lichen. Harnessing the traditional Japanese expertise of kimono dyeing, designers were able to formulate a dye recipe that is more resistant to decay through repeated experiments. The accompanying fountain pen, a product of skilled craftsmanship, features a clean and modern design completed with a leather finishing. It exemplifies a gentle love for nature and the beauty of the design.