Where is the black nucleic acid code of Sichuan Tianfu Health Link?

1. First open the QR code of Sichuan Tianfu Health Link, and then take a screenshot of your own green health code.

2. Secondly, enter the gallery and modify the color of the QR code with iodine.

3. Finally, choose black as the color, and you can get a black code of Sichuan Tianfu Health Pass.