In contrast, at -0.84 V (Figure ) there is a weak induced absorption with a magnitude of 1 mOD, in accordance with Figure . We argue that at this potential, there is a small density of states from the PbS conduction band that is filled/emptied with the locked-in frequency. Therefore, all absorption changes at this potential will be amplified. The total ΔA is the sum of the bleach due to Pauli blocking and the increased background absorption. If the density of states at this potential is small, the resulting ΔA will be positive. At -0.92 V we now observe the expected bleach of the 1S h -1S e and 1P h -1P e transitions for the first two measurements before hypsochromic shifting and induced absorption sets in. The accessed density of states is larger at this potential, such that Pauli blocking overcompensates the increase in background absorption for the initial 2x30 min. At -1.0 V, dominating Pauli blocking prevails only during the first 30 minutes, presumably because an electrochemical process, such as the reduction of Pb 2+ to Pb 0 provides additional scattering. We also observe the same hypsochromic shifting to 1350 nm under these mild conditions as previously shown for the complete reductive scans. Overall, these control experiments support our hypothesis that the induced absorption found in the reductive scan direction of all PbS QD samples are mostly due to the long exposure time in the electrolyte. We conclude that the measurement duration should be kept as short as possible, for instance by recording survey EMAS spectra first, followed by detailed spectra at selected wavelength ranges. An example is Figure , recorded over 14 h, and Figure , recorded over 60 min, with identical samples. Importantly, the potentials at which |∆𝐴| increases in both cases are almost the same.