When steam is used for disinfection, the steam must be in direct contact with the disinfected object, otherwise the microorganisms on the disinfected object cannot be well killed and the disinfection effect cannot be achieved.

For the disinfection of books, coins, calligraphy and painting, it is best to use ethylene oxide fumigation in professional institutions. If you need to handle it yourself, you can also use ultraviolet light at close range (within 1m) on the premise of personal protection. Or peracetic acid fumigation; Or ozone disinfection.