Pigment matter in mature fibers of brown or green cotton was extracted by organic solvent (ethanol, aether and dimethylbenzene), acid and alkaline solution, and HNO 3/ethanol.

• 以白色棉、棕色棉和绿色棉的成熟纤维为材料；用有机溶剂(乙醇、乙醚、二甲苯)；酸性、碱性溶液；以及HNO3/乙醇溶液；分别对不同颜色纤维中的色素进行提取.