Industrial alcohol should not be used for disinfection when diluted. The active ingredient of both industrial alcohol and cooking alcohol is ethanol. The different occasions of use have caused a significant difference in the manufacturing process of the two. Industrial alcohol has a purity of 95%-99% and is mainly produced by both synthesis and brewing (corn or cassava), with the cost of synthesis being very low, unlike edible alcohol. Industrial alcohol contains impurities such as methanol, aldehydes and organic acids, which greatly increase the toxicity. China explicitly prohibits the use of industrial alcohol to produce a variety of alcohol, industrial alcohol can not be used for human disinfection, because methanol can lead to poisoning, used for skin disinfection will also be partially absorbed by the skin, poisoning can lead to blindness in serious cases, and even death.