The main component of iodophor is active iodine, which is concentrated between 1% and 3% and is tan or brown in color; the main component of violet solution is mercury, which is used to kill bacteria by mercury and is purple in color. Iodoform is relatively widely used, and can be used on wound surfaces, inside wounds, in the mouth, perineum, and mucous membranes, because it is not irritating and has a very broad bactericidal spectrum. Purple drops are generally used to apply and disinfect the surface of skin abrasions to promote scabbing, but if the wound is large or deep, it is not suitable for the use of purple drops, and if the body uses too much purple drops may lead to mercury poisoning.