Natural Indigo .There are more than 1000 years of cultivation history of plant Common Baphicacanthus Rhizome and Root ,It is Natural Indigo traditional main source. Indigo content is high as 2.0 - 3.8%, indirubin content is 0.15 - 2.0%, The product is in full compliance with the 2005 version of "Chinese Pharmacopoeia."Our products are purchased directly from the processing base to prevent the occurrence of the phenomenon of adulteration.