Historically, this has been used, as the true Indigo dye, for thousands of years, and it is still used for many purposes, some of which you would not expect. The color can either be intense almost black/blue to the softest powdery blue. Imagine having this ability to use, right in your very own back yard, a beautiful shrub, that can also create the most beautiful dye, and you can sell the leaves for a pretty good profit.
