Indigo Pulverata Levis (Persicaria tinctoria), known as “Chung-Dae” (CHD), is a blue powder extracted from the indigo plant. Of note, CHD has been used for centuries in traditional Chinese medicine to treat infectious, inflammatory diseases, ulcerative colitis, and latent fever [Tang W., Eisenbrand G. Chinese Drugs of Plant Origin. Springer; Berlin/Heidelberg, Germany: 1992. Chinese drugs of plant origin. Chemistry, pharmacology, and use in traditional modern medicine].

https://www.ncbi.nlm.nih.gov/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745452/#:~:text=Indigo%20Pulverata%20Levis%20(Persicaria%20tinctoria,fever%20%5B17%2C18%5D.