Indigo is a natural dye that has been used since ancient times to produce beautiful blues ranging in scale from azure to deep, almost black blue. People have a hard time dyeing with indigo because it's a difficult dye to work with, mostly because it's not water soluble. In order to solve this problem, the main coloring component is extracted from the leaves of the Indigofera Tinnctoria plant with biological and environmentally friendly methods. The main coloring component of indigo blue is indigotine. Indigo is a dark blue crystalline powder and is insoluble in water or alcohol. First, it is made soluble in an alkaline vessel by removing oxygen by the fermentation process. Natural indigo is really better as it can create a deeper blue and because it is insoluble in water you can wash natural indigo multiple times with no color loss. Natural indigo is a sustainable dye; After removing the pigment, the plant residue is composted and can also be used as fertilizer.