Details about purple sweet potato pigment: purple sweet potato is extracted from ipomoea batatas l roots and stems immersed proposed a natural pigment, anthocyanin substances belonging by anthocyanins and sugar glycosylation reaction occurs. it is bright color natural , non-toxic, has anti-mutagenic, anti-oxidation, relieve liver dysfunction, anti-high blood sugar and other nutritional, pharmacological and health care functions, is an ideal natural food coloring resources . specs: commodity name: purple red colorcolor value e(1cm, 440 nm): e1%30, 40, 50, 60, 70, 80appearance: purple red fine powderloss on drying: