Indigotin, also known as indigo, is widely used as a dye in the textile industry, particularly for coloring denim and other cotton fabrics to achieve the classic blue jeans color. Its ability to bond strongly with fibers ensures long-lasting and vibrant coloration. It is also used in the production of inks, paints, and for dyeing paper. In biological and chemical research, indigotin serves as a staining agent for microscopic analysis due to its distinct color and stability. Its non-toxic nature and versatility make it a valuable compound in industrial and scientific applications. Note that water-soluble derivatives, such as indigo carmine (E132), are employed in the food industry as a natural blue dye.