“…Due to their good chemical stability, light resistance, weather resistance, and strong hiding power, inorganic red colorants are widely used in coatings, outdoor displays, building materials, and other fields. [1][2][3][4][5] Red colorants (e.g., CdS 1Àx Se x , Pb 3 O 4 ) are currently widely used, but most contain toxic heavy metals such as lead, chromium, and cadmium. [6][7][8] Therefore, it is urgent to find an inorganic red dye that is safe for the environment and non-toxic.…”