What is the normal color of the page scanning Zhoukou Tong?

There is no color. Zhoukou Tong is used to register places. Just after registering in one place, when passing through other places, scanning the code will show the pass code, and the place will leave a pass record, so there is no need to register again. Avoid handwriting and long waiting. Zhoukou Tong itself has no color, and the viewing colors are generally travel codes and health codes, which are used together with Zhoukou Tong.