Some areas have different requirements, as long as they are not travel itinerary with stars or yellow and red.
The health code in each region is different, and the health code in some regions is blue. For example, Shantou health code blue represents people with normal body temperature, and red represents key people with fever. If the tester makes a mistake, the measured temperature result cannot be modified or deleted, and the health code can be scanned again. Generally speaking, health codes do not need color printing, but the regulations in each region are different.