Povidone-iodine is a loose complex formed by combining elemental iodine and polymer support, and povidone plays a carrier and solubilization role. At room temperature, it is a yellow-brown to brownish-red amorphous powder. Slightly odorous, soluble in water or ethanol, aqueous solution Chemicalbook is acidic, insoluble in ether, chloroform, acetone, ethane and carbon tetrachloride. Povidone-iodine aqueous solution has no disadvantages of iodine tincture, shallow coloring, easy to elute, little stimulation to mucosa, no need for ethanol deiodine, no corrosive effect, and low toxicity.