The following are contraindications to the disinfection of iodophor: 1. iodophor is a strong oxidizing effect of iodine ions, which plays a major role in disinfection. if a large amount of iodine ions remain in the broken skin, it will cause some damage to the skin, so alcohol should be used for deiodination after using iodophor. 2. iodophor should increase its concentration when disinfecting organic matter, because organic matter is resistant to iodophor, so as to ensure effective 3. iodophor is corrosive to some divalent metal ions, such as aluminum and steel, so it cannot be used to disinfect products containing such iodophor. 4. iodophor should be stored for two years and should be sealed in a cool, light-proof place. 5. alkaline substances will reduce the effect of iodophor when they act together with iodophor. 6. iodophor takes more than half a minute to disinfect injection sites. 7. Red mercury and iodophor should not be used together, as red mercury, i.e., red potion, and iodophor together will produce mercury iodide, which is highly toxic and can damage the skin and may cause poisoning.