Explore all shades of indigo , from lighter to darker shades. See HEX codes, shade names, and indigo color palettes. Click any shade to copy its HEX code. Indigo is a natural blue dye obtained from plants of the Indigofera genus, mainly used for denim cloth and blue jeans. Learn about the history, sources and uses of indigo dye, as well as its chemical structure and properties. Learn the all information about indigo color , from its meaning, specific color information, and color schemes to applications.