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During COVID-19, we need to disinfect public places repeatedly. However, as people disperse in public places, it is difficult to know which public areas have been touched by the crowd, which makes disinfection extremely difficult and consumes huge amounts of manpower and resources.By attaching a temperature-sensitive color-changing material to the surface of handrails, the color-changing handrail can sense the temperature and change the surface color, to mark the areas that have been touched. Not only handrails, but many kinds of public contact surface can load this material, which can help with disinfection effectively.