Origin

The character 紺 combines the radical 糸, which represents thread or fabric, with 甘 as a sound component that hints at the pronunciation "con." Because the character uses the thread radical, it originally referred to a colored textile or dyed fabric. The specific color—dark blue or navy—likely comes from a particular dye that was commonly associated with this type of cloth in ancient China and Japan. Over time, the character became the standard way to write the color itself, even when not specifically referring to fabric.