To further verify our hypothesis, we reduce the integration time at each potential to 6 min by decreasing the spectral range. Additionally, the step width between the potentials is doubled to 120 mV to cut the total measurement time to ~60 min for the whole scan. The corresponding EMAS spectra at reductive potentials are displayed in Figure . For -0.84 V (e.g. at/slightly below the conduction band edge), we observe a weak induced absorption. At larger potentials (e.g. -1.08 V), a prominent bleach occurs at the 1S h -1S e transition. For even more negative potentials, S-shape EMAS spectra evolve, which indicate a hypsochromic shift, for instance due to partial QD etching. We obtain similar results with PbS-C, where fast reductive scans show a bleach of the excitonic transition until -1.2 V, after which S-shape EMAS spectra evolve (Figure ). Consistent with this finding, we note that Vogel et al. have specified the stability window for PbS QDs to ≤ -1.1 V 15 . We continue with a discussion of the importance of the phase shift in EMAS for determining the sign of the differential absorption. ΔA is measured by a photodetector in terms of a corresponding differential photovoltage, ΔV, which is anti-correlated with ΔA (see Figure ). Since a negative potential should result in negative ΔA, that is, positive ΔV, it follows that a textbook bleach is resembled by a phase shift of 180° between the oscillating potential and the oscillating ΔV recorded by the photodetector. Likewise, an induced absorption for reductive scans is resembled by a phase shift of 0° between the potential and ΔV. Since electrochemistry of QDs is sluggish, the ΔV-response will always lag behind these precise values to some extent. In Figure , this is taken into consideration by attributing all phase shifts from +45° to +180° to a bleach and all shifts from -135° to 0° to an induced absorption. In principle, these values are subjective and may lead to an erroneous attribution of the sign of ΔA. However, our results show that the phase behavior in the EMAS spectra in Figure is highly robust (for further examples, including those used for Figure , see Figure ). Except for the results with low amplitude, all phase shifts lie deep within their respective tolerance window with typical phase shifts for a bleach of +130° and -70° for induced absorption. We conclude that an erroneous phase attribution is unlikely to be the cause for the unusual induced absorption at the 1S h -1S e transition in Figures 4+5 for reductive potentials.