Iodine volts can be left for 3-7 days after opening. After opening, iodine volts can be left for different periods of time depending on the frequency of use and the aseptic operation, but the longest open iodine volts should not be left for more than 7 days. The normal expiration date of iodophor is about 1 year, but after opening, there is a possibility of contamination due to repeated use and exposure to air. Moreover, iodophor belongs to complex iodine, which can volatilize and crystallize. If opened and exposed to air, iodophor can cause loss of iodine due to volatilization and affect the disinfection effect. So iodophor should take good measures after opening to make it as long as possible. When using the iodophor liquid can be poured into a clean bottle cap for use, the concept of aseptic operation should be reflected in the use, and disinfected cotton swabs should not be re-dipped into iodophor.