The light color of the C area of the new crown antigen test may be due to the short reading time of the data, which causes the C area to show a lighter color. The light color of the C area may be due to the relatively short reading data time, it is generally recommended to observe the reading data after 15 minutes, but if the reading is started before 15 minutes, the color may be lighter, but the test results are the same, and there is no essential difference. Antigen test results C light color, while the T color is dark, red or purple, then the results shown for a dark and light, which is also a positive antigen test performance, with two bars are dark results, there is no essential difference. If the color of the C area of the antigen test is light, and you doubt the result, you can retest the test again. If the color of the two tests is dark and light, or if both bars are dark, it can be judged as positive, and you need to go to the fever clinic in time to complete the nucleic acid test.