Indigo dyeing is a traditional textile dyeing technique that uses the natural dye extracted from the leaves of the indigo plant. This process involves fermenting the leaves to create a blue dye, which can be applied to fabrics like cotton and silk. The dyeing process often requires multiple dips in the dye bath to achieve the desired shade of blue. The unique aspect of indigo dyeing is that the dye appears green when applied but turns blue upon exposure to air. This method has been used for centuries in various cultures, including in Japan and West Africa, and remains popular for its vibrant color and eco-friendly properties.