Therefore, any change in volume fraction, due to a transfer of water towards the oil droplet, should be monitored by rheological measurements. We thus performed viscosity experiments on our double emulsions, with a fixed initial oil fraction (0.5), but for various polymer concentrations (from 0 to 20%) in the oil. Here PVPone was added to 1-octanol, so that the emulsion could be prepared at RT. For standard emulsions, this addition of polymer in the dispersed oil phase has no impact on the emulsion viscosity, consistent with the Krieger-Dougherty law. However, we observed that the viscosity of the emulsion significantly increased when increasing the amount of PVPone in oil (Figure ). induced by water diffusion. In particular, we observed that at an initial volume fraction of oil of 60%, gels were obtained when forming the double emulsions. This elastic texture is not yet expected at this oil fraction, and was indeed not observed using polymer-free octanol dispersion at that fraction of 60%. But once polymer is added to octanol, the water transfer increases the dispersed phase volume fraction, eventually over the jamming threshold (about 65 %), and a jammed gel-like texture is obtained.