The validity of linear equation of silver TNPs concentration (cTNP) and critical iodide concentration (cci) for different batches of silver TNPs was also studied. Five batches of silver TNPs (No. 1–5, withmax of 605, 600, 568, 540, 511 nm, respectively) were used for establishing the relationship between cTNP and cci. Similar as thee stablishing of Eq. (1) in Fig. 6, eight different concentrations of the each five batches of silver TNPs were used for estimating critical iodide concentration (Supporting Information, Figs. S8–S12). The five calibration curves (1–5) of cci and cTNP were shown in Supporting Information, Figs. S13. We found that if the max of aspreparedsilver TNPs was in the range from 540 to 600 nm (violet-blue or blue color), the calibration curves are very close to each other.