The effects of several chloride and perchlorate salts (NH4+, Na+, Mg2+, Tb3+) at high concentration in water on the optical absorption spectrum of the hydrated electron are studied. For a given salt, the hydrated electron spectrum shifts toward high energy as the salt concentration is increased. For the same chloride salt concentration, the blue shift of the hydrated electron spectrum increases with the charge of the cation, the largest corresponding to the pair formed with Tb3+, studied for the first time.