All MD results discussed so far have been obtained in the limit of zero added salt concentration, c s = 0. However, the salt concentration within porous salt crusts is expected significantly different from 0. Indeed, prior to evaporation, the experimental concentrations of the NaCl and Na 2 SO 4 solutions were chosen as 4 M and 1 M, respectively (see Methods section), and during evaporation, the concentration is expected to reach saturation within the pores (at least locally). The salt concentration within nanopores can even reach supersaturation, as has been observed for NaCl solutions confined in silica nanopores . To evaluate the effect of finite salt concentration c s on T 1 in the case of confined liquids, simulations were performed for slit pore systems with size h ≈ 7 nm and c s up to 5 mol/kg in the case of NaCl, and up to 1.5 mol/kg in the case of Na 2 SO 4 (Fig. ).