... by our company, is extracted from purple root tuber of edible purple sweet potato (Impomoea batatas ) planted locally ... slicing, extracting, filtrating, purifying, concentrating, sterilizing(pur purple sweet potato color/natural food colouring ple sweet potato color ... 0001,000Pathogenic Bacteria NegativeNegative Applications and Usage Instruction: Purple sweet potato color can be widely used in wine ...