Going now to RSX-PBE0 provides a different picture of the spectra. While decreasing the silver/gold ratio from 120/0 to 20/100, the silver plasmon band at 4.54 eV of the pure nanostructure first redshifts to 4.58-4.69 eV (multi-picks) and then to 4.37 eV. In terms of shape, the band width enlarges and splits. Its intensity strongly decreases. On the other hand, a small intensity band at 3.89 eV starts to raise for Ag 20 Au 100 . This band is characterized by a well marked superatomic character but a negligible collectivity. We assign it to the increase of the gold plasmon band (with a low collectivity) since it also lies within the expected 3.7 to 4.0 eV energy range. When the silver/gold ratio reaches 0/120, the position of gold plasmon band redshifts to 3.87 eV and its intensity increases, remaining however much less intense with respect to the silver one but characterized by a larger collectivity. We thus conclude that even if the range-separated hybrid approximation tends to overestimate the energy of the silver plasmon band, it is the only approximation able to reveal the emergence of the gold resonance.