After cyanidin interacting with some metal ions, the bathochromic shift occurred due to the interaction between metal ion and ortho-dihydroxyl group at the B-ring of cyanidin molecule [12] as shown in Fig. 2.
After cyanidin interacting with some metal ions, the bathochromic shift occurred due to the interaction between metal ion and ortho-dihydroxyl group at the B-ring of cyanidin molecule[12] as shown in Fig. 2.