Indigo, both natural and synthetic, is a widely used dye known for its deep blue color and rich historical significance. Natural indigo is derived from the Indigofera plant, offering a sustainable, eco-friendly option for dyeing textiles, particularly cotton, and silk. Synthetic indigo, created through chemical processes, provides a more cost-effective and consistent alternative with the same vibrant blue hue. Both types of indigo are valued for their colorfastness, offering long-lasting, vibrant shades that resist fading. Natural indigo is especially popular in artisanal and eco-conscious markets, while synthetic indigo is used extensively in large-scale textile production. This versatile dye is commonly used in the fashion industry, particularly for denim, where it is synonymous with the iconic blue jeans. Indigo’s applications also extend to leather, paper, and even art, where it is prized for its rich tone and historical significance.