This Natural indigo pigment is produced in southern India, using traditional time tried processes. Tests show indigotin content at +/- 40%.
You can see how here.
Natural indigo pigment is not the same as the other natural dye extracts, the beautiful blues that result from this pigment are produced in a fermentation vat and not by immersion dyeing.
An instruction sheet for an organic indigo vat will be sent as a pdf with your order confirmation email.